Love the artstyle, the animations really add charm to the game (Suggestion: add a GIF of the game to your game page to show them!). It term of presentation, I really like the simplicity of the UI and the tutorial.
Gameplay wise, it's a bit too simple in my opinion. Maybe you could add something to spice things up, like some kind of powerup?
The first time I died, I didn't understand what was happening, I thought the game had crashed: Maybe display some kind of game over screen?
Nice submission overall, especially for a game made in a single day ;)