RUSH charges you with placing all manner of signs and directions in order to guide trains of moving cubes from Point A to Point B. So in other words, it's a laid back puzzle game. Admittedly, I'm very bad at puzzle games, either out of impatience or stupidity. I made it all the way through the medium puzzles before having to walkthrough the rest of the game. That said, the puzzles are complex and rewarding, as you get to watch a colorful show of cubes after cracking a puzzle. The game really encourages a "trial and error" approach to puzzle solving, allowing you to tweak your solution until it finally works. It doesn't punish you for a wrong solution.
While this type of puzzle design is nice, it's not very well-accomodated. If you want to test your solution, you have to run it from the very beginning, rather than being able to jump to a certain moment like a simulation. This also means messing around with the awkward camera controls. The overall visual design is bright, and some levels can take up the entire screen, making viewing a level with ease damn near impossible. Not that it hinders your ability to solve puzzles unless the game throws really complex structures at you, but it makes debugging your solution and observing the level a little more uncomfortable than it should be.
RUSH's simplistic visuals may be a turn-off for some, but hey, it's a puzzle game. You add onto it some stellar music and a wide variety of puzzles and gizmos, and you've got a game worthy of any puzzle addict's collection. Unless you're feeble-minded, like me.