It's a fun game but I felt like I didn't do any damage to the boss at the end, so maybe a health bar would've been nice, sounds would make it better but I saw in the game's page that you plan on adding sounds.
Hi! Yes, the boss stuff is a common complaint I see. The idea was that the boss has only one vulnerable point (it's dangling "lantern"), but I didn't have time to make this clear through the game design.
I'll add a note into the game description, at least.
