Great job! This was really really quite well done and simple yet addictive.
In reply to HyperionSniper below - this was a Pico-8 cartridge and those were allowed to use the keyboard since they don't have mouse support, it's in the rules so the game is fine on that front and I would argue that it is incremental since it does have an upgrade system and the ship will start shooting on its own without player input required.