Note that Puzzle Quest 2 on BFG doesn't have the two Steam patches. Among other things, this means you can't drag gems, you can only click twice to swap them.
Might or might not still be worth it for you, but I probably would have avoided it if I'd known.
I'd grab Super Metroid first thing. I've never played it before, and I've been waiting until I got a Classic Controller to get it. So, perfect timing.
With the remaining points, probably Paper Mario. Again, never played it before, and I need a cheerful game to play with finals coming around...