Goodness me, I do not have words to express how excited I am by the idea of something in the vein of The Lost Vikings or Trine, but with musicians! I love this concept!

The characters aren't animated, but I can see each one being charming with a little animation. The music track is lovely, but I feel like the game would resonate better if an additional stem for the currently controlled character was brought in (a little percussion for the drummer, etc.).

I'd love to hear some aural feedback on abilities, and indicators of when an ability is used in a context where it doesn't do anything.

Unfortunately, I wasn't able to pass the guitar puzzle, and ended up downloading the game's source to identify what had gone wrong. It turned out that the tilemap references that checkpoints and bridge have were using a bad node path, and were referencing null instead of the tilemap. I assume this was working at some point and was later broken when restructuring some of the level's nodes. I've opened a pull request with a fix.

After fixing that, I was able to progress much further, but needed to make some level changes in order to reach the final checkpoint. So far as I could tell, Bridge_3 isn't working, and there were a couple of jumps that I had to put extra mushrooms in for. Since I'm uncertain whether the level was "finished" before the end of the ja, I've not included those changes in my pull request.

If you end up doing more work on the game, I'd love to play more!