Here are the conversions from the uploaded zip from geoo. Not sure if they around here yet but here they are. 1 set is for the old
lemmix players and the other set is for neolemmix. I already have them working with my old players (1st set) and also with neolemmix 2nd set. they are for original lemmings, oh no more lemmings, holiday 93, 94 lemmings and 4 extra level files that were in the uploaded zip(Go for it!, lemming lament, it's not over till it's over and Don't make the wrong choice). In neolemmix the levels I noticed have a width of 1584 to about 1600. compared to the originals, most way smaller than that. in some levels
one can really see the difference (ie taxing 22-come over to my place, the level has much more green water to the left and right)
or oh no more lemmings wild level 12 snow joke with a lot more snow past the exit to the right.
NOTE: the .lvl for neolemmix won't work for old players and old player .lvl files are not used for neolemmix.

also the neolemmix levels need to be packed using the pack tool kit but this is quick compared to the converting.

The only thing is at those deadly water drops, it's supposed to show dripping water all the time(as a warning). play those in neolemmix extra levels(sega). you will see the dripping water.

I found the genesis version music for the special levels (from Zophar's music domain) awesome, beasti, beastii, menace, sunsoft special. just use the neolemmix editor to put them in the appropriates levels. that site has music files for many games, not just lemmings.

1) the top and sides are dead zones. example in original lemmings mayhem 23-going up... when the lemming goes to the top right of the wire he walks off and dies. in lemmings he is supposed to turn around. in neolemmix, one has to use a blocker there.

2) no speed up in oh no more lemmings wicked level 2-inroducing SUPERLEMMI. no speed up without using fast forward. Even Superlemmini has this as a speed level.

3) many times the cursor changes the size of the playing screen and it's annoying when it happens when trying to finish the level.

Superlemmini doesnt have these issues.

and I don't like that it has no option for timed bombers as in the other ports games

thanks I installed it already.

Here is the genesis megadrive pack for neolemmix. I converted them from the superlemmini pack that was available. The music is also from the genesis version available from the neolemmix website(expect for the specail
 music in which I just used the dos version for those) just inzip these to a new neolemmix player folder. put the levels folder into the levels folder, styles into styles, and music into music folder

Also it would be nice if you added ohaya lemming san level from the SNES Version since you have some other levels already there from like the amiga set and dos' vacation in gemland.