Nice work here! While it's a simple space-shooter, I do find it to be pretty engaging. The graphics are eye-catching, and the feedback of destroying an enemy ship is just delectable! I did notice that the projectiles shot by enemies are capable of killing the player instantly, which could probably be explained in the instructions even in not intended. Also, since a new wave of enemies won't spawn until the last enemy on screen is defeated, you can end up getting a really easy victory by simply leaving one enemy alive and moving to dodge them. Maybe having enemies spawn on a timer instead of when all enemies are dead could work to incentivize the player to be more proactive in killing enemies! I do like how you added in a visual effect for when the player takes damage, in addition to having an audio cue for it as well.