Just finished the single player of pixeljunk shooter (with all SP trophies), I doubt I will bother with multiplayer. The last boss was a pain in the ass, took me like a dozen attempts.
I can definitely say I enjoyed the first 3 areas better than the last 3, the first ones were more based on puzzles where as the last 3 were more traditional shooter.
Overall I would say 8/10, very happy to have got it free on plus as it's not a game I would have thought about buying.