Fun, face-paced, and challenging. Agree with BMoconno, a little retro music that scales with the speed, and some sound effects for explosions and such would be a nice touch. I could point you in the direction of some good free resources if you are interested!
Viewing post in Watch out for the asteroids! jam comments
I got a good sound effect pack for free here : https://soundsbydane.itch.io/8-bit-sound-pack