A very nice game! I’d probably make the camera move a little faster, or even make it look ahead of the player, since it’s not very convenient that only about 1/3 of the screen shows what’s ahead of the player while you are moving forward. The main mechanic needs some work as well, since right now in the absence of violet enemies you can just click both left & right buttons and not care about whether the enemy is red or blue. Maybe add a shooting cooldown or fixed amount of ammo? Anyways, good job!