thanks so much for checking it out, and for sharing how far you managed to get. like old school NES titles, this game isn't meant to be finished on the first try. just keep grinding away and you'll get it. and yes, you're meant to eat a lot of damage during boss fights, hence the importance of saving up enough HP.
as for the glitch, i'm not sure what's causing it. i test this game on firefox and chrome and have never run into that. what browser do you use? i implemented an alternate outfit recently which is red and may have something to do with it (press right + attack at title screen to use it).