Adorable but I find it difficult to look at, not because of the graphics but mostly the camera moving really fast while also scrolling trough repeated sprites, Ideally this game would have limits on how the camera would scroll up or down, or even make the camera follow the player slower while moving vertically.
The night level is too much on low visibility I don't think is needed to dark shade also player and the level.
The space level is also difficult to look at because the background moves too fast, I would also make it darker so it doesn't seem to confuse the player what is foreground what is background.
Nice ideas about movement, is not exactly easy to pull off cause I feel is too much timing dependant but I can see fun in speed running the game once mastered.