Very fun little game! It felt very satisfying to try and speedrun it by jumping over certain platforms to skip them. If only the game had a little more tight controls it would be perfect.
For something like the jumping I'd implement a "ghost" jump like they did in Mario. Don't make the player jump from a pixel-perfect surface, but add like 100ms or something of being able to jump after you've touched a surface. It might seem like cheating, but it'll make the game feel a lot more fun to play I think.
Overall super well done though! Great use of the theme. Well done!