Neat multi-agent puzzler, nice weird atmosphere!
Very colourblind-unfriendly, though. Even with full colour vision there were quite a few levels where I just could not see what the difference was between the target colour and the colour I was trying for. I couldn't progress past the level with a single dark green target in the centre, so unfortunately I couldn't finish the game.
Lots of credit for implementing undo (it would have been a nightmare without it), but I would have loved a "reset" as well; waiting for the undo stack to unwind a lot of messing around often took a while.
Overall a great entry that makes a lot out of its fairly simple visuals; I had a lot of fun playing it, and I hope it was fun to make!