I would dive into the IRC chat if I had any idea how it worked...
As for the Irritation levels that have me stuck:
I just realized I've cleared 19/40 levels so far. If I can beat one more I'm gonna call that a victory.

Problem 1 is a trick question because you said "displayed hamsters" and I can't fit enough hamsters on the screen at once to get that high of a value. My computer would probably crash from trying to display too many at once.

Hoo boy. Just from a cursory playthrough of the first 3 levels, I feel like this is gonna be another one where I can't clear out rank 2. Oh well, I'll see what I can do. Looks fun anyway!

The music changes are definitely a step in the right direction, but there's still some improvement to be made. Here's a few tips for you.

Firstly, you can use 'Stereo track to Mono' from the Tracks menu to convert the song to a single track. It sounds almost the same but reduces the filesize, and makes it easier to work with.

Secondly, metadata tags. You don't have to have the loop start at the beginning of the track and end at the end. By using metadata tags, you can avoid losing the intro to songs like Gritzy Desert.

To do this, you'll first want to click the arrow next to one of the selection viewer windows at the bottom so that you can view the selection position in samples as opposed to minutes and seconds. The metadata tag uses samples, so you'll need these numbers.

Next, find a point in the song that makes for a good starting point for your loop. It can be a part that's easy for your ear to recognize, or a part where the waveform stands out somehow. Once you've selected that point, make note of what sample number it's at. I like to have a .txt file open to record these numbers. To really make your loop sound pristine and hard to detect, pick a point of zero amplitude on the waveform.

Do the same thing with finding the endpoint to the loop and again, make note of which sample number that's at. You can use Ctrl+1 to zoom in and Ctrl+3 to zoom out, so you can pick points precisely.

To test your loop, highlight the whole section of the loop, hold Shift, then click play. This will play the selection and loop it when it reaches the end; ideally, you won't even be able to hear when the loop happens.

Once you've got the whole loop section picked out, note the length of the loop in samples. The endpoint doesn't actually matter; what you need is the start point and the length.

If you want, you can trim off any section beyond the loop to cut down the filesize. (You should also trim the start so there isn't dead space before the start of the song.) Another good idea is to amplify the whole track to match the amplitude of the other songs you're using so that the volume is streamlined. It's nice when you don't have one song that's way too loud or way too quiet.

Once that's all done and you have the start point and loop length, you're ready to export. Use Export Audio (from the File menu) and you'll get the option to add metadata tags. Add two tags and call them LOOPSTART and LOOPLENGTH. For their values, enter the values that you recorded earlier. Export the file and it should work in game!

I've attached the Skull Dungeon theme after I reworked it by following these steps so you can see what it looks like when it's done. It seems like a lot at first, but with a bit of practice it becomes pretty easy. I may not be able to beat people's tough levels, but I can make sure they have high quality music!

Dreams are kinda strange with me. I don't really have them often at all. Maybe I do have them and just don't remember them, or perhaps I've just gotten into the habit of immediately dismissing them because I feel they aren't worth sharing. My mom is the dreamer in the family; she usually has something to share about the funky business that went down in her subconscious.

Started playing this now. I've finished the first rank (they're getting hard already) and am working on the second rank (two down so far). A few things I've noticed...
Levels look very good and have clever solutions. Well done there. I've gotten stuck on a few, but nothing for too long yet, which is good. It would be really discouraging to get locked up on the first rank... I speak from experience on this one.

The custom toolbar looks pretty good. I can tell what skills are what at a glance, with one glaring issue... The number '5' and the number '6' look exactly the same; they both look like fives. That's a big problem. I didn't actually notice until Irritation 3, where I thought I had 5 builders only to discover that I actually have 6.

Great music choices! I'm hearing some Skyward Sword, some Oracle of Ages, some remixes of standard Lemmings themes, some Partners in Time, some Bowser's Inside Story... The songs don't loop very well, though... I like to use .ogg files and manually set up the loop with Audacity. Making it loop properly really does make it sound and feel nicer, especially when you're stuck on a tough level. Should you like, I'd be willing to teach you how.

I'm wondering if I should try getting into these sessions at some point, but I've seen the chaos that can result in 2 player Lemmings matches. Trying to keep track of what 8 players are doing would probably make my head explode.
Plus, my internet connection is often spotty and my computer is 7 years old, so if my head didn't explode then my computer might.