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How about Xcom: Enemy Unknown for the Killing Floor Complete Bundle?
I'll even throw in 1 or 2 ref if you want.
I notice you don't have the original Trine, but you have some time spent in Trine 2. Trine 1 is a game that I think is better than Trine 2 just because of the truly inspired level design and Trine 2 feels like it's just pulling out more levels. I can offer Trine 1 for Killing Floor.
Indie Gala Flashpoint 3 Full Gift URL's left
Games
BTA Games
http://store.steampowered.com/sub/28702/
Bonus Cubium (DRM Free)
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