Fun game! I thought it had some really nice music and great artwork, I especially liked the backgrounds. The level design and controls were also good, however the difficulty could change very quickly: for example level 13 and 14. I played until level 21 and it was mostly enjoyable, although it did become frustrating at times (I suppose that's the whole point though ). Also, I didn't understand the use of the stars as they seemed to serve no real purpose, perhaps you coulld use them to unlock a new page of levels? I also thought that some kind of story or premise could have added to the character of the game, but that's just my opinion.
Overall, a really fun platformer with a nice aesthetic and lots of polish - 4/5