An excellent and well put together game. While exceedingly difficult at times, mastery of subtly adjustments and recognizing patterns make Rivea accessible to anyone (though I can't imagine playing on a trackpad). The bright colors and up tempo music give it a very lively feel and the rainbow of colors actually helps the player differentiate between sources of bullets. The last two challenge levels are brutal to say the least. The only time I experienced lag was during the second boss fight when I was firing the beam and using the gold shield at the same time; otherwise I had zero problems throughout the entire game. I have had a pleasure playing and will definitely be returning to defend my ranking.