I like retro-style and atmosphere of the dungeons in the game. 1-bit game visuals has its vibe and looks consistent. Nevertheless, I'd add some colorful spots, maybe as VFX. The SFX and music stuff is OK, but it's not looped, it stops at the end and never repeats. A "bag of coins" that taking a slot and ability to discard it seems as controversial mechanics to me. My suggestion is to add a mouse support in menu and game (for a keyboard, I expected ESC key to exit sub-menus like control/credits, as well as for the CANCEL key in the game).