Very nice game, I really liked it!
But I'm not used to those "inverted" up/down camera controls, so if you're going to continue this game, add an options menu where you can choose camera controls :)
The boss was good and looked really cool aswell! But since he's a flame I didn't really want to jump into him at first because I thought that he would damage me if I did, so maybe show the player how to damage him in some way? idk