I enjoyed it! The artstyle is nice. I don't fully understand the ghosts (?) in the first level (I don't remember if they were in the other levels) but I think they gave the game a bit more atmosphere.
It's a bit cumbersome to manage jump, dash and switch world... but I'm sure with more time I'd get used to it. I think next time, if you don't have time to finish a level you should just remove it! Level 3 actually does work well as a last level, but level 4 made me very confused until I realized it was incomplete.
Well done! You'll receive a good rating from me :)