Discovered a strange issue just recently: cyan artifact #3 (19:195) respawns after the player dies or leaves the room, regardless of whether or not it has been collected and the game has been saved. This can lead to a rather silly situation where the player can pick up all 7 cyan artifacts simply by collecting that one, saving, dying, and repeating 6 more times. This doesn't seem to happen with any of the other cyan artifacts.
Also, I don't know if I asked for this before, but I would definitely appreciate some way to 100% ensure that the player can't shift themselves inside the center of a pink disappearing block (15:37). I presume you could solve it in a manner similar to how you handled the new invisible blocks?
Also also, the water works great! I feel like there's some room for clever implementation in the level I'm working on, but I'm not sure I want to expand the scope even more, at this point....