Fun! I wish there was more progression like a couple of more enemy types or some special skill you could use, but it totally works as it is.
Toooootally off-topic: would you be willing to make a (or know of any existing) keyboard overlay for game-streaming that briefly shows for a second in any one specified corner of the monitor whatever keyboard characters are being pressed in real time, before fading away the keys' graphics? I could never figure out how to get OBS's keyboard overlay to work, especially with the NumPad. That'd be swell!