The game is a bit slow, maybe a more progressive speed would be fine, good job

Nice little shooter. I'd like to see a HUD with a button to cycle through coloured weapons rather than a button for each. I kept forgeting which button was the colour I needed. Also I'd like more destructive power to play with like power ups, gun upgrades and maybe a bomb that destroys everything on screen :)

Nice use of the theme and good job on the limitation use for the particles. I could see the explosion size reduced a bit though.

Aside from the particle systems, the gameplay was smooth. The use of particle systems overall was not a good choice, given the limitation. Other than that, the game was relatively generic.