So fun! :) Personally, the difficulty was chef's kiss. Took me less than 10 tries per level, which was enough to challenge me but not frustrate me. Loved the art, the theme, and the personality.
If I could suggest something, I think making the player actions a bit more fluid would make the experience better. For example, shooting mid-air, continuing the melee animation even if you jump or land on the ground, adding generous jump buffer/coyote jump. Great job guys!