Nice take on Asteroids! I like the gradual ramp up in difficulty, and the music was great. I'm going to echo other commenters that some SFX would have really helped, particularly when firing. I noticed things seemed to flicker on and off screen sometimes, and sometimes asteroids or aliens would spawn suddenly in the middle of the space, which felt unfair. Also, at first I was confused when I got hit, because my ship just disappeared for a bit. Some additional FX there would be a big help. Finally the counter for remaining lives on the left seemed like it was on a lower layer than the obstacles and was often obscured. But it feels like a pretty complete game otherwise, and I had fun!