I enjoyed this short experience. Having a gun that only kills Enemys with the same color sure is a unconventional weapon. Still i felt like everything was moving too slow (player and most enemys), the enemys did not really feel like a threat an i think it might be possible just casually walk by them to the end of the Game. One thing that somehow annoyed me was the "You cannot kill them with your Weapon find a red energy core" message that appeared on my screen and never vanished again until the end, since the text just blocked the new hints that came in. Graphics are ok but i think the sounds are unfitting. Still a playable experience.
Got to the red core, killed a bunch of red guys and then suddenly on my way to the next area I was killed when an enemy spawned in front of me. A little too punishing for the player. Nice idea for the color tho. It is like "Ikaruga" but first person :)
When I ran past those red enemies into the next room.. And I saw them coming I thought that I'm screwed :D But I fount the red core :) The message that instructs to find the red core does not disappear but all in all this is a great game :)
Still a playable experience.