Yo! Nice game!
I really dig the 1-bit artstyle; it's very unique. The graphics, sounds and gameplay are all simple but good, fitting the theme of the jam. I feel like the game could use some particles; maybe some pixels fly out when you pick a coin, or a small dust cloud when you jump. Small stuff like that.
Also - I really like how a sound effect plays when you reach the peak of your jump, although I think the sound effect ya'll chose is a bit too hard on the ears; a more subtle sound would make this feature even better.
Overall, fun, nice game.