This is really cool! graphics look nice, music is sweet, and the way you linked the enemy drops and shops to the player's health is really creative and works well. Honestly if you do continue to expand this the only real thing that could use some work would be polishing up the mechanics. (Some quick pointers I would recommend is keep enemies from spawning on/ right next to the player, (maybe) open the doors when the boss is killed (I wasn't done exploring, though this one isnt needed), fix the esc button, and offer a little explanation on how/why you win because I beat it 3 times and I'm still not quite sure what causes that) but other than those pretty nitpicky hiccups great job, especially for three days!