Just beat Pid, decent game. Great visuals and music, the gravity mechanic is fun and there are enough clever ideas to keep you going. On the downside, a few sections get dangerously close to overstaying their welcome and the floaty controls are serviceable at best. All in all I had a good time and would recommend it if you don't have indie puzzle-platformer fatigue. I played on normal with a gamepad, took me 9.8h.
Mind you that I played it
post-patch, the one that adjusted the broken difficult spikes in normal mode that were souring the experience for players, so I don't know how the game was before the update. As far as I know the PSN and XBLA versions weren't patched.