Was funny to realise I can shoot coins as well after beating a game, some parts felt oddly “difficult”, now I know why! The idea of a platformer is cool, for future project look into camera buffer zones so the camera is not moved with the player all the time, which can cause motion sickness and eye fatiuge as you are trying to line up jumps. Not a big problem, but due to the speed of your game it is enhanced.
Graphics are clean and mostly, some stage elements do need experience to realize what they do (spikes and bouncepands weren’t fully clear at first) but it is not a big issue.
Sfx and music were okay, I do think your bass line sawtooth could be decreased in volume as it should be a supporting part of the track not in the forefront.
Overall lovely idea cool little game!