I enjoy the game! The upgrades are particularly fun to play with. I think the movement is a little confusing though, probably due to the pull force of the planets feeling a little random (are they timed? what are their area of effect? do they hurt me too?)
I feel like if you had a invisibility for 1 second or less, after the player is hit, would make it a bit more fun as it will give the player time to respond.