Thanks for playing!
We were going for that kind of level design, glad it paid off and works well.  There were plans to add colored spikes so it made a bit more sense, but there wasn't enough time to shove them into the game so it was scrapped:
For color swapping, there's one fatal flaw, and that's with being blue. Since it has nothing that really stands out for it, it was a bit harder to think of anything to use it for other than being used as little gates to slow down whoever the player. Other than that, I like the mechanic too, and it's definitely my favorite part of the game as it has a lot of potential to be used and improved in many ways that I can't think of right now.

Glad you like the game! You're right, the color mechanic isn't exactly described well, and that's mostly a product of being scared about the time we had left, and me not wanting to bother adding more signage. (I had a lot of issues with scaling an image by two pixels for some reason aaa) I'll try to write some actual directions for the page, but for now, this is basically everything that's needed to know about the mechanic:

I also probably should have created some signage for wall jumping and wall sliding, the levels I made, level three and four, depended on that quite a lot.

Thanks for playing our game :)

The only reason I suggested ZXC is over something like RYB is that the keys are physically a bit difficult to place your fingers on a keyboard. That would ruin the experience since it's extremely difficult to press those keys in quick succession compared to ZXC in a row.