Game play is simple and entertaining, the difficulty increases rather nicely (if a bit to easy in the first 2 levels for my liking, especially on repeated playing)
The Storm damage mechanic elegantly leads to some nice risky moments where I go into may more danger than I normally would just to keep the high damage output. It would profit from the storm moving around, or any other incentive to move every now and then, as right now for the most time I just stick to the center and shoot like crazy. (Reached a score of 135 without moving out of my center point :D)
The opacity for the particle effects means it's not strictly 3 RGB colors, but you clearly tried to follow the restriction so I think that no real problem^^