This is an arcade space shooter in a similar style to Asteroid were you aim to score as high as possible with the lives that you have.
As the game progresses, the enemies get faster and more numerous so you'll have to dodge plenty as well as shoot them. Changing colour is very important to your score, as not only will you do more damage, but you will gain many more points if you're the same colour as the enemy you kill.
WSAD / Arrow keys: Move
123 / Shift: Change colour
Mouse: Aim & Shoot