Here is a compilation of levels made by me after the Snack Pack and until today, and some new ones as well (that's where the pack name came from, you see).
Here's what one of the levels looks like:

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Apart from that, this pack contains new levels which you may enjoy, contained in a separate rank; here's what one of these levels looks like:

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Tested to be compatible with NeoLemmix versoin 12.9.2.

To install:
1. Download NeoLemmix from here here and extract it to the folder you want.
2. Download Assorted Gubbins (link below) and extract it into the main directory of NeoLemmix.
3. Download the music for Assorted Gubbins (link below as well) and extract it into the main directory of NeoLemmix.
4. Run "NeoLemmix.exe". Press F2 in the main menu for the level browser, the levels of both the Compilation and the Assorted Gubbins (proper) are there for you to play.

DOWNLOAD LINKS:
1. Assorted Gubbins (v 1.00)
2. Music (for Assorted Gubbins)

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Many thanks to both the people of LemmingsForums for their help and the creators of the music used in this pack for the inspiration to make this level pack happen!

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Music used in this pack:

Spoiler

Anvil - Path To Nowhere
Arcanum
CnCTSMutants
desertdream
EmaxDelicate0ooz
firebr (from Unreal Tournament '99)
hurrican-aztech[url=http://[url=https://www.youtube.com/watch?v=X-jpi3gnr98]hurrican-factory]
[url=https://www.youtube.com/watch?v=X-jpi3gnr98]hurrican-factory
hurrican-ice
InsideTheTreeDaxx.mp3
jpsewers
Lizardking - 11l_kintro3_short
Lizardking - Art of Chrome
MQSMMFireGrotto
mysterworlds-forest
PhantomUT99 (from Unreal Tournament '99)
pkmnw2reversalmtn
PurifyingArrows
Razor-ub
runnin'throughcastles
SaveMe (from Unreal Tournament '99)
Sheep-Technopolis
Skyward (from Unreal Tournament '99)
the_wall
turr1lvl2-2
turr2alien
UnWorld2 (from Unreal Tournament '99)
walker_factory_mix - a mix of Turrican II - Mr. Walker and His Factory and a remix.

Occurs in level Mayelo 7 in the Festive Millas 2018 pack.
True physics mode switched on by holding the keyboard key (not the panel button, which toggles it) and crosshair hovering over some of the decorative teleporters to the right of the exit, which yields an exception (log file attached below).

The Wall Tileset (Turrican 2)


Here is another one based on Turrican 2!
This time packed with 2 levels!!





Special thanks:

Designers of these graphics and Turrican 2: Manfred Trenz, Holger Schimdt, Andreas Escher, Julian Eggebrecht
Original soundtrack by: Chris Hulsbeck
Help, testing and feedback: IchoTolot

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Download the tileset and the levels HERE.
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Installation: after downloading, extract the archive into your NeoLemmix directory and play!
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Please don't hesitate to comment so that I can improve!

Alien Tileset (Turrican 2)

Here is my first ever NeoLemmix tileset! It is based on the Alien levels from Turrican 2.



Special thanks:

Designers of these graphics and Turrican 2: Manfred Trenz, Holger Schimdt, Andreas Escher, Julian Eggebrecht
Original soundtrack by: Chris Hulsbeck
Gronkling for giving me permission to copy the triggered trap from his Cyber tileset
Flopsy for correcting the old version and converting it to the new formats as well as showing how to use the GSTool in his tutorial.

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New Formats - Tileset download
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Old Formats - Tileset download
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Music (suggested) for levels using this tileset - download
(should be put in the "Music" folder in the main NeoLemmix directory)
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Some other suggested soundtracks for this tileset:

Spoiler

Lemmings 3D - Alien 1
Lemmings 3D - Alien 2
Lemmings 3D - Alien 3
Jazz Jackrabbit 2 - Dark Groove
Turrican 2 - Check the Gripper
Chaos Engine - Fortesque Mansion (World 3 BGM)
Alien Breed 2 Theme (Amiga)
Alien Breed - Tower Assault Theme (Amiga)
Battlescape #1 - X-Com Ufo Defense Music
Battlescape #2 - X-Com Ufo Defense Music
Disposable Hero - Level 2
Disposable Hero - Level 3
Red Alert 1 - Mud
X-COM Apocalypse Soundtrack - Alien Worlds
X-COM Apocalypse Soundtrack - Recyclotorium Sweep

Please don't hesitate to comment so that I can improve!

This is the crash message from yesterday's session:

Hello, you!

I don't like to come to a party empty-handed, so here's one I prepared earlier!



Snack Pack




(a sample level)


* * *
This pack is mostly inspired by Oh-No! More Lemmings, with my history with it going back quite a few years now. There was scarcely anything close to a tool like NeoLemmix or a way to share my creations like this forum, available to me at that time. A few months ago (at the time of writing) I started watching some of Flopsy's Let's Plays and heard him mention NeoLemmix and the Lemmings Forums.
You can imagine i felt like a kid in a candy store when I came across those!
- - -

The pack consists of 20 levels in a single rank, without any particular order. Each of the levels enforces a time limit.
Players are expected to possess knowledge of the official games (Lemmings, ONML, Tribes, etc.) but experience with custom packs available on this site is suggested as well. Perceived difficulty usually depends on personal experience of the player. Fare well, and save all those Lemmings!

- - -
The pack is compatible with NeoLemmix Player V10.13.

The .NXP file is attached below.

Complementary soundtracks are attached below, separately (they need to be put in the "Music" folder - it should be created if it doesn't exist yet in the NeoLemmix main directory).
* * *

*****
Special thanks go to:
+ DMA for the original game
+ EricLang & ccexplore for Lemmix
+ namida & Nepster for NeoLemmix
+ Flopsy's works for introducing me to the topic and inspiration
+ Alex A. Denisov for Graphics32
+ Eric turner for ZLibEx
+ Un4seen Development for Bass.dll
+ Volker Oth and Mindless for sharing the source code and information
+ IchoTolot, Nessy, Proxima, SimonN, Nepster, the rest of the Lemmings forums Community and everyone else who helped me with this effort!
*****


NeoLemmix Player (V10.13 required)

Pack itself (.NXP)

Complementary music

The custom soundtracks are:

Spoiler

Level 7: Lemmings 2: The Tribes (SEGA) - Shadow Tribe
Level 16: Lemmings 2: The Tribes (SEGA) - Egyptian Tribe
Level 20: Anarchy - In The Kitchen (Amiga Demo) ( https://www.youtube.com/watch?v=edA-BVDrprI )

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Flopsy's Let's Play of this level pack (spoilers!)

Spoiler

https://www.youtube.com/watch?v=mh8Coh55aAs&list=PLXsuXbpwwJzHt_RomM12nV9jw4GIo6bGZ

IchoTolot's playthrough of the pack (spoilers!):

Spoiler

https://www.youtube.com/watch?v=t5bJ9fL8-cs&list=PLKR1N9oJTTlIjaFTbxB8RS1-lqRYphbTd

Kaywhyn's playthrough of the pack (spoilers!):

Spoiler

https://www.youtube.com/watch?v=xIA_ZUvCDLE&list=PLbp2m4KlFpJtdxK8DMDMFBOutoTP5pWhj