Really cute game, here are my thoughts:
This game is oozing with charm. The bat is fun to play as, despite having a frustrating movement mechanic. I do like how so much is done with so little, with the level design exploring everything the character can do in a rather concise manner. I didn't realize that I could fold my wings in by pressing s until rather late, it wasn't crucial for beating any levels but perhaps a smidge more tutorializing would have helped there.
Overall, solid work, will be looking forward to more.