Let's just get this out of the way: Yes, Quantum Conundrum is a first-person puzzler, just like Portal. Yes, it was designed by Kim Swift, the project lead on Portal. And yes, it shares some of Portal's core traits: there's a physics-altering arm device, a goofy omniscient narrator, and an alarming number of buttons that need to be pushed.
But Quantum Conundrum crawls out from its spiritual predecessor's mighty shadow and stands, triumphant, as a game that's unique, raw, and brilliant in many ways. Finally, Portal has a worthy rival.