Very interesting gameplay for how simplistic it is. The shooting mechanic being a limited resource (time gated) and being used both for your own movement as well as dealing with enemies makes for some interesting decisions about how to use it. I could see some potential for pretty difficult levels requiring some quick decision making, which is impressive given you only issue one input per couple seconds. The gameplay even makes sense in the flavor of the game!
Great execution on the idea too, especially given a fairly short window, the art feels cohesive and charming. Everything feels fluid, and the music fits in.
Agreed with other comments on a tutorial of some point, it could be very brief but just show the player they're intended to move their character by blasting. Also one nitpicky thing, it wasn't clear to me if the orbiting planets/moons/whatever damage the player or not, there might be something visually to improve that.