Another solution that gets both talismans in the same solution. I still use a lot of precision here but no steel abuse this time though!

Dayum... nice backroute!  Patched it because I don't like unfair precision and it isn't what I was after.  The intended gold talisman solution is pretty clean.

R1's are V1.

Changelog History of R2:

V2 - Increased height of steel veins to patch a backroute from Velixi. Added more decorative veins.
V3 - Extended length of steel veins to the left of the sphincter(!) to patch a backroute from Kaywhyn.
V4 - Moved leftmost tooth to patch a backroute from Kaywhyn.
V5 - Returned to V3 as a base to reintroduce backroute, but made it slightly more difficult to pull off.  Bronze talisman time reduced from 3:45 to 3:30, and new gold talisman to complete using only 12 skills.  Some other minor terrain changes.
V6 - Changed shape of leftmost hill to patch backroute from Kaywhyn.
V7 - Added extra steel veins below the sphincter to patch a backroute from Kaywhyn.

Changelog History of R3:

V2 - Small modification to the terrain at the waterline to patch a backroute from IchoTolot.
V3 - Extra entrails and blood drips underneath the platform to patch a backroute from IchoTolot.
V4 - Lengthened an entrail above the skull to patch a backroute from Velixi.

Very strange. I'm not currently at my laptop so I can't test this immediately. Has anyone with a Windows machine noticed this?

Best guess is that it's something to do with hotkey priority, I'll take a look at it soon.

I personally like the colour cycling, but can see why it may be annoying or counterintuitive to some users. Settings could allow users to specify a colour using a hex code, I'll look into this soon.

Outline wouldn't be the best idea for water and/or OWWs because in both cases the trigger area affects whatever it overlaps, including any added terrain.

The idea of CPM is to make it clear where the triggers are, pixel by pixel. Outlining is at best asking the player to work it out instead of just showing it, and at worst could even render some trigger areas invisible (if the outline is outside the terrain piece, for example.

I'm typing this on my phone, I'll come back and add some visual examples later.

As for the colour, I see no reason not to allow users to specify whatever colour they like. I'll look into whether this is feasible.

@Crane

Monster Munch resolved again. The 3:30 talisman wasn't a problem, but the <= 12 skills one was very hard to figure out and took me a really long time. There were plenty of things I've tried that would had worked but ultimately most use 13 skills or fail because of pixels with too high step ups. In the end, the <= 12 skills talisman also satisfies the time attack talisman, and again I'm not sure if you intend for both to be obtainable in the same solution. If the latter one is acceptable, I'm quite curious what you intended for that one! At least in my solution, it needs a lot of precision!

Enjoying life is difficult at the moment, but thanks!  Hanging in there is hard.  In the meantime, backroute alert.  V6 released.

Monster Munch resolved once more. Got both talismans in one go. Not sure if this is intended or acceptable, though. Thank you for the clarification on Discord, because I honestly fail to see how you came up with the thought that I don't think highly of your R2. Quite the contrary! I think it's a fine level itself! So, relax, smile, and enjoy life

In Lemmings 95, if playing on Windows XP SP3 (or just on my specific XP device, not really sure), vertical lines will randomly start being drawn if level tiles are coming from the right side.
Compatibility mode does nothing here, not sure how else I could fix it