Hello, thanks for submitting a game!
Let me start with music. I liked it, it was simple and catchy enough, if I could change one thing I would probably try to have it loop seamlessy rather than having the audible start / stop.
Controls: Not allowing WASD on a computer game is a strike for me, I would have preferred that as the default. The platforming controls felt good and natural, well done there.
Visual: Got a bit of a meat boy vibe but thats probably unavoidable with the game type. One thing that might have changed things up is having a bit more definition on the platforms themselves, even something like having different colors on the levels or something. It got pretty samey. I like the fuzzy edges of the moving blocks as well as your effect where you can see the ghosted tail of the stuff moving when its dark. In general everything was pretty easy to read as far as good / bad and what it was going to do, so nice job there.
Story / Narrative: Obviously not really a story game, but there was nothing there. Something to think about. Sometimes something as simple as some flavor text on the menu screen can set a bit of a story vibe.
UI: No real UI. Some potential things you might have shown: Attempts. Timer. What level you're on.
Mechanics: The colors fading when you moved was unexpected and looks cool. I think that you probably (at least on higher levels) should not let the player rest and have the world go back to colors, since in most cases there isnt any danger and you can just stop and see where you need to go. Solid platformer otherwise.
Fun game and great job in the time allotted!