I didn't expect to like this so much when nobody rated it before me :-)
But this is a cool little game and if I were you I would remove the "very early build" note. From my POV, this is a proper game jam material, it's nice, it's small and it's fun. If you could provide a WebGL build so it's playable in the browser, I think many more people would play it and enjoy it.
If you polished the controls a little bit and added some sounds, this would be a great little game.