Pretty cool! Like others have said it's confusing at the start, but once you get it the game is fun to explore. Ideally there would be checkpoints: since the spear enemy is quite fast and players have never seen an enemy like it when they first arrive, it's very easy to die and having to restart completely makes it hard to learn how to beat his and makes people less likely to want to keep playing. It seems from your comments that you've learned a lot about the importance of tutorials, so keep that in mind for next time! Nicely done :)