Simple and wholesome. I think it's too bad the enemies are just enemies, feels like they're here for gameplay purpose only, as jumping on / killing seemed against the overall narrative to me (although I did notice you tried to make it feel as "friendly" as possible through the signs). Having an option to reason with them somehow and show them grouping up regardless of differences is ultimately the best option would've been a great way to set your game apart, as of right now it feels kind of like a default platformer, although I'm sure you learned a lot making it :) The school on fire ending was a bit surprising, in a good way, and it would've been cool to have it be more expanded, and not just a cutscene.
As previously mentioned, the overall movement feels a bit too slow and floaty, it's too bad you forgot about enabling pixel perfect graphics, as it muddles the overall look a bit (especially the icons). The graphics and music fit well together though, even if you didn't make them, you did a good job at creating something coherent. My only remark on that would be to add a skybox or clouds in the background, even a gradient, because as of right now, just having the sky blue is a bit plain.