Thanks, geoo.
I personally think, that the non-round ones look most like concrete and not like steel, are therefore the least confusing.
Of the round ones the clearest seem to me the ones to the far right, whereas the ones one the far left still look somehow shiny like steel.

Flopsy's next Lix video (Quirky 29+30 as of v. 0.9.4), which contains the attempts to "Snowball Battle". The level haunted me as well for quite a while. It's rough in its own way.

The first lix has always spawned at phyu 60.
[...]
Since NepsterLix was well-maintained near the end of C++ Lix's life, assume 2 seconds before spawn. Then D Lix would time-out a solution at phyu ((time limit in seconds) * 15 (phyus/second) - 30). For one minute, this is phyu 870.

Shouldn't the 60 phyus be counted in the calculation for D-Lix or do I have a thinking error?

Yeah it's basically about discovering that airclick cancels.

Airclick is undocumented except for an annotation in the options menu, to (framestepping back cuts replay yes/no).

I just noticed that it is actually explained for the "Neustart" button in the options menu as well but I started playing with 0.6 and this was not yet translated.
(For framestepping back cuts replay yes/no there was even a German description in 0.6 but it didn't mention it (and still doesn't.) The English description is too long for 800x600 (windowed), so that it doesn't show this information there for me either. But most will probably play with higher resolution. I even chose that framestepping back cancels replay, which was a solution for me for rewinding then. I still think it's the best option for playing levels (though not for watching replays).)

This is probably again one of my specific problems and has to do with how I encountered Lix as I started playing it.

The main question is:
Is there any (unobtrusive) way to make the in-level-replay in its working clearer?

In particular:
The fact that and how you can cancel the replay (when using e.g. restart).

As I started playing Lix that really messed with me since I thought I was caught with my former actions forever.
I messed something up or just wanted to restart the level, but then by using restart the replay just repeated all my actions, which I actually wanted to redo. I think I soon realized that it cancelled if you assign a skill but sometimes you want to move an assignment forwards and not backwards and that didn't seem to be possible to me.
Form that experience I have still the habit to just completely quit and enter a level if I want to restart it.

To be clear I don't want to speak against the replay functionality. It's just an experience report from someone who started playing Lix mainly with knowledge of L1 but not of newer engines and I'm not sure if there can be done anything against it.

Edit: It just gets to my mind that I even played Lemmings for Windows (1995), which had already the action replay functionality but I think I never used nor understood it at that time.
 

and reuploaded the archive with the Allegro .lib and .dll files.

I noticed that it only contains DLL-files. Out of curiosity: Are the .lib-files not necessary anymore?

Sorry, I found a very precise backroute and had to fix that.

I've tried to improve it with a bit modified bridge tile groups and attached variants to "Korean Border Crossing" and "Abridged Version (V1)" + replays but no matter what I have to leave it for a week or so.
I hope replays and levels fit together.