Tons of character! I quite enjoyed this. I especially liked how the levels built on one another, it's something that seems to get neglected often in jam games. I think what Pug is referencing is that while the bullets, blood, text, and background had a polished look owing to the post processing, some of the textures on the blocks and player were in a conflicting style.
I think the simplest way to fix the incongruity would be to up the stroke size on the details for each of the latter items (e.g., character's outline + eyes, cracks in the platformer stage) - could go a long way to giving it a bit more overall cohesiveness. Also as Pug said, not really an issue, and your consistent use of color helped to tie it together anyway. Excellent submission, and hope to see your work in more jams!