So... I'm not insulting the game or anything, but i have some ideas to improve this.
1.Some animation for Yumo. I mean, at least one or two frames.
2.Checkpoints! I know this is a common suggestion, but it's fair.
3.Pause and Music. there could be a button in the corner to pause, and in that menu, there could be a music option(for music/no music.)
4. More + shorter levels. I would like the game a bit more if there was a hub area that you can enter shorter levels through.There could be a sort of save tower(maybe the hub is a town?)
I understand how hard it would be to code without lots of experience(I can tell you aren't a trained professional(maybe).No offense.)Otherwise, I really like this game. I'm sorry for putting up these in case they offend you in some way, but these are goals that you should reach for if you want do be a game developer full time.