The gameplay is fast and furious, often with multiple opponents. You have a myriad of psionic powers that you acquire through out the game. There are different skill trees of psionics, such as Fire, Lightning, and Demonic. Each of the schools have unique abilities, such as Flame's Fireball or Eye of Ra's Sun Shield. Each has tactical advantages and disadvantages, however.
Some powers have a longer wait until they are performed, but are devastating if they connect.
The powers are well balanced and work well for multiplayer and single player alike. My biggest fault with Sanity lies within the camera movement. I have yet to see a game where I'm completely satisfied with camera movement though. The camera doesn't seem to zoom out quite far enough, which at crucial times means that the enemy can see you and you can't see them. It's especially frustrating in multiplayer.