Pretty nice game! The art is really good and the music & sfx are nice additions. The music though tends to get very annoying after a bit due to the very short loop time. If you're using a song that's going to be looped over and over you tend to want to extend it a bunch before it loops. If its being listened to for a bit a 1 min loop is fine, more than that and you want it to last 2 - 3 minutes (or above if you're making ambient music and its in the background for hours). It needs to be long enough where people cant pick out the patterns in it immediately. Also something for post jam would be adding stuff like randomly playing wind sounds and other misc ambient noises to add differences in the track on each loop.
The pick up coin sfx (and jumping sfx) is also way too loud compared to everything else. The number to move tended to be very annoying more than anything but that may just be me talking as a speedrunner. The jumping mechanic is a really nice touch although it took me a bit to discover it and I only did by spamming everything on my keyboard to try to get through the wall.