Trine 2 - Complete Story (Linux) It fixed all the issues I had with the (old version of) Trine 1. There is a bit enemy variety now (although mostly goblins) and at least after the base game, you see new kinds of environments like a desert, the inside of a giant sandworm, a crypt, a town, etc...
Since I grew up with "The Lost Vikings" on SNES by Silicon Synapse (later known as "Blizzard"), I adore the concept and which more games like this were made but Trine 1+2 are more than worthy to the throne and since Blizzard doesn't give a damn about it's old gems, we can't expect a new "Lost Vikings" anytime soon.
The graphics are absolutely stunning and this is the case technically on the one hand but especcially when it comes to actual design. Everything seems very alive and real in its own universe.
I'm happy to have bought a proper Nvidia card a while ago because this game and Shadow Warrior 2013 seem to be made for high quality gaming on Linux.
In addition to way more variety, the expansion introduced some technical glitches as well (mostly sound) which weren't gamebreaking though. The puzzles in the additional worlds need proper use of the higher abilities of the characters and add a bit of difficulty. I still haven't understood how to break fragile stone walls under water, but that's ok, I've found a lot of secrets myself although there is really much to find and I will play it again some day in order to enjoy it again and find more stuff.
Conclusion:
One of the best games I played in the last years and although it is linear, the replay value is very high.
PS: The German voice-over really sucks.
List:
http://www.gog.com/forum/general/games_finished_in_2015/post68