Great pixelart and mechanics with the flying. I think the difficulty should be adjusted a little, when you start, it's too easy to get killed while figuring the controls out and after you fly in bat form, there's no downside to not being a bat and it's impossible to not be killed. Maybe additionally levels or give the enemy a way to climb up to you.

Great effort and cute pixel art on the main character.

Maybe some more of a threat would be nice to the feel of the game as for now it's a little easy. Maybe a score too?

Nice little concept - would like to see you expand on it.