hey there! played your game and its looking good so far! the animations and overall vibe are very good. i have a few notes however,
first off, the levels can be a little annoying to traverse, for example sometimes the hitboxes for the platforms dont match up with the sprites, and there were a few problems with the bounce mushrooms, such as a point where it was directly in the middle of a hole with 2 chests inside, making it difficullt to get to the chests without just bouncing up and down on it, or when it seems to line up for a row of floating coins, but just throws you into the ceiling spikes.
another thing is that enemies can be a little annoying to fight, theres essentially no warning when theyre gonna attack, so its quite hard to avoid, but they also seem to die really easily as well, leaving a not very satisfying fight. i know its still early in development, but id think about improving that :)
those are the most glaring issues i found, but i loved playing it, and am excited to see where it goes :)