The Aesthetic of this game is truly enthralling with quite the amazing artistic design choices both visually and audibly, I would love to see a steam port and perhaps a more fleshed out version.
Some additions could be an endless mode, different opponents, different game settings, and as others suggested perhaps multiplayer support.
I know all of those take a lot of time and effort especially to get done right, I absolutely love the game as it is but would definitely love to see it be fleshed out.