Pineapple Smash Crew (PC)

I'm always up for a game with randomly generated dungeons.  Most of the titles that I play that are like this tend to be fantasy RPG in nature.  However, one exception to this that I came across not so long ago was Pineapple Smash Crew, which is a fast-paced action shooter featuring randomly generated levels.  There are still RPG elements to be had, as your squad can level up over time, though they tend to die and get replaced quite often.  The game also seems to be mildly obsessed with giving you hand grenades to play with.

Monday Night Combat Screenshots (PC)

I really like the sense of humor in this game, and the different classes are a bunch of fun too.  Now there's even a free to play sequel in the works.  Huzzah!

Dungeon Defenders Screenshots (PC)

Dungeon Defenders is a very action-oriented tower defense game.  It's become quite popular since its release, and has a ton of DLC.  Personally not my cup of tea, though.  I much prefer Orcs Must Die! and Sanctum. ^_^

A.R.E.S. Screenshots (PC)

A.R.E.S. is a very short Mega Man clone.  Not a bad game if you can get it on the cheap.  Wait for a Steam sale! =D