this is really fun! great graphics and music. definitely got that game boy vibe to it. i liked the addition of switching the palette. i meant to do that with my game and forgot about it. the gameplay is also really nice, but i had a few small complaints:
1. the controls were really uncomfortable for me. the CTRL key on my keyboard is very small and at the bottom of the keyboard next to the arrow keys, so hitting that was tough.
2. it took me a minute to figure out the bombs were bombs. i guess there's not much you could have done to make them stand out more.
3. i also wished the jump would go just one tile higher so i could climb back up a few times after accidentally falling off a platform.
these are small criticisms though. well done overall!