Nice little prototype!
I think the hitboxes could be a little more generous towards the player to help foster those cool feeling moments after a close dodge.
Might also be neat to have the planes lean left and right only when they're moving left or right.
See if you can hide the mouse pointer (it was still over the player plane for me).
Sounds would help liven things up a bit too, but I'm guessing that's coming in the future.
Good job! Keep it up, and I'm looking forward to seeing more!
By "generous hitboxes" I mean making it easier for the player to dodge enemies (which can be a combination of size and precision). For example, if the player and enemy sprites were circles, I would have the hitboxes be a few pixels smaller in diameter than the sprite itself. That way there's a little wiggle room for the player, and the sprites have to really overlap for a collision to occur.
Sometimes if the hitbox covers more area than the sprite (whether it's too big or a different shape), or even is the same size, the collision can feel a little jarring, sudden, or unfair. Even if it technically is fair (eg: hitbox is exactly same shape and size as the sprite).
