What I liked: very good visuals, cute and pleasant style, pleasant music, jumps are felt well.
What I didn't like: it's not clear what to do, where to go. The level design is branched, but there are no guidelines, neither visual, nor in the UI, nothing.
Also about the enemies. It is not clear at first what to do with them and how to overcome them. It is not obvious why the hearts are needed. I noticed them on the screen only about 10 minutes into the game.
That is, the main problem is that there is no tutorial, neither contextual, nor textual, nothing. And this is a problem.
What could be improved (in my opinion): in many platformers, standing on a platform, you can press the "Down" button so that the character flies down from the platform. This is convenient and familiar.
The static background with dots also starts to irritate the eyes, I understood it to be something like space or a starry sky, but why the background doesn't move when the level moves is not clear, it's very confusing and irritating to the eyes.
Overall, the game is not bad, but because of what was said above, you can't play it for more than ten minutes. That's how it is.