The color scheme and pixel art are on point. I like the simple in-game control tutorials and the head throwing mechanic is a lot of fun!! However, I didn't even realize there was a checkpoint system until I read some of the other peoples comments. Why not a similar visual cue like the controls at the checkpoint? Also, the instant death if you're hit without your head got old really fast and flatlined the fun for me.
Better telegraphing to the player what's happening and maybe less of a "get good" difficulty would have motivated me to keep playing. I'm down for a hard game but when it kills the fun it's over for me ☹️
I'll probably go back at some point to play again because I see a good game there. Really great job! 😃