Really cool game. Was pretty hard in the beginning, but as soon as you get the hang of it, it is fun. I especially like the innovative use of the theme to replenish health and the controls / movement.
Some minor inputs, in case you update the game after the jam:
- Some music would be cool!
- The font is not super readable.
- The enemy shots are a bit too big for my taste and I think the hitbox for the airplain is pretty small. I would have made the shots a bit smaller but then also let them collide with the wings of the airplane.
Anyway, congratulations to a cool entry!