There's not much here to dislike. The old-school aesthetic is nice, the game plays super well, the controls are simplistic, and although it isn't strictly a metroidvania, I do love the interconnected rooms that make this feel more like a dungeon crawler. If there is one change I would make it would be to make it more metroidvania-esque. If anything, I'd recommend using Mark Brown's Dungeon Graph to plan it out.