This was fun! There's not much to say that others haven't already, but I think that this game really should've either had hints or less strict achievement requirements to get past each zone. Like others, "Death of the Artist" had me stumped for a while, and having something to mitigate getting stuck with one or two achievements gating progression would've been nice, and actually allowed for some more challenging puzzles to shine without being a roadblock. I probably spent half my playtime between "Death of the Artist" and all the flower puzzles. On that note, the references in the achievement names were cute. Having to look them up to figure out what colours I had to trigger was not.
But besides that, it's very solid for a jam game, especially given it's length! Movement's good, the bouncy gun and doublejump projectiles were very satisfying, everything looks and sounds pretty good, the tone is nice and goofy which feels appropriate for this sort of game, and the final area was really good in terms of puzzles.