Shots in a loop

You’re a scientist, in a secret submarine, in the height of the cold war working on secret science business. Suddenly, both soviet and American soldier’s invade your ship to get your secret science.
You have a nice digital gun, but due to a malfunction, it's now taking input from the sounds of your speakers Rather than having control over your own gun, it's stuck looping the rhythm of the current tune.
On short beats, your gun will shoot red bullets that only har soviets, and on long beats, your gun shoots blue bullets that only harm Americans.
Both groups will tackle you, and if they do 3 damage, you die and have to restart the level. To beat each of the three levels, you have to defeat 50 soldiers.
Can you fend off the soldiers by timing where you aim your shots correctly?
Controls: move with wasd, and aim with a mouse.

My older sister made the animations for the player character, and I did the coding, sound, music, weird looking enemies, and game design.