It's Asteroids, but shooting the smaller-sized asteroids creates a hole in the space backdrop. You can shoot through it, but you can't fly through it, so between the holes and the constantly-spawning Asteroids, you're literally "running out of space" as the game goes on. The green asteroid will erase any holes it's on top of when you shoot it.

You may be wondering, "Isn't that the boss from your LD41 game?" Why, yes it is. I've decided that each of my Ludum Dare entries will contain a reference to my previous entry, and so every time an asteroid spawns, it has a 1% chance of being Karen's closed-off heart instead. (Speaking of Love Is A Battlefield, my current aim is to release it during September. August will be a busy month for me.)

To be honest, I'm not too happy with this right now. I feel like it's too difficult, and the collision detection is too buggy and imprecise - note the heart disappearing when the player respawns, because it thinks it's overlapping. I have the whole of tomorrow to try and implement a pixel-perfect collision detection system, but I don't know whether I'll be able to, especially without killing the game's performance.

For now, I have the menu to implement, and that'll be easy enough.