I've bought:
The Lost Souls (Chapter 2 pre-order) $1.99
Bombsquad $4.99
Amazing Frog $9.99
Neon Shadow $1.99 (on sale)
Minigore 2 Zombies $4.99
Potatoman Seeks The Troof $2.99
Get On Top $1.99

That's all I can think of right now.

Total: About $31