Just a few problems
Okay the game was very fun, but there was a few problems. First my screen is dark and I couldn't see the "Play" button (not the one in the begining the one on the title screen) I couldn't see the "nstructions" button either, but I wouldn't have that problem if I had a brighter screen but you might want to fix that. Also as "The-Lizard" already stated you need to add/fix the back button on the instructions page. The most annoying glitch was that the music started over if you used the "right-click" menu to go back, which brings me to the final bug I found, which is when you get gameover it's impossible to play the game again without loading up the whole game again.
Now that I got that out... The game is very fun and imagitve, and the simple storyline is a nice touch. The color thing was fun but it would've been nice to mention that the blue and purple beams can split green atoms without hurting you, i avoided green atoms for like 10 min before i realized theres no need to. Power-ups where cool, but like "The-Lizard" also said you forgot to mention the purposes of the "Med-Pack" and "Nuke-Sign" Power-ups/downs. It was very fun and very addicting and other than the little bugs It was very well made... Good Job!