You got the basics in but it's obviously very early. i guess level 6 is the last? game just crashes after a while because its spawning too many objects. Here are some thoughts:
- There's not much danger right now, enemies spawn and stay where they are, i never once got threathned
- No inertia on the player, im assuming it's in space so it would make it more interesting and fun if the player moved less binary
- basic effects are good, i would go all in on that. use geometry dash as inspo
- arrow showing the last few enemies outside of screen so i dont need to do a slow circle crawl trying to find them