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.

Satazius (PC)

I like the games that come out of the doujin scene, so I've been quite happy to see companies like Carpe Fulgur, Rockin' Android, and NyuMedia translating these games for a Western release.  One such game is Satazius, which is very much a homage to the Gradius series.  It has a nice 16-bit visual style, good music, well laid out levels, and solid controls.  If you like old school non-bullet hell shmups, I recommend checking it out. =)

Rochard (PC)

While Trine gets most of the attention among puzzle platformers on the PC these days, Rochard is another game in the genre well worth a look.  It goes with a more sci-fi theme to it as you play as an asteroid miner named John Rochard, and you have to stop some evil doers from getting their hands on some ancient technology while solving puzzles and blasting bad guys.

Zeno Clash (PC)

This is a very unusual game with strange, surreal visuals, and a confusing story, yet it's also strangely interesting.  Zeno Clash is filled with odd-looking creatures, and a pre-industrial punk-like sensibility.  It's a first person action game where you spend a lot of your time punching and kicking enemies, though there are still times where you can use firearms.  The game is very short (only 4-ish hours), but it certainly is an experience.

Revenge of the Titans (PC)

2011 was a crazy year for tower defense games.  It seemed like there were a couple of new ones coming out every month, all claiming to have some sort of twist that made them stand out.  Really, though, it was just a bad case of market saturation.  Revenge of the Titans was one notable exception for me during that period.  It had a really great retro charm to it that made the game really appealing, the equipment you could get was neat, and after each map you could assign new projects for your research team to look into  It's a game definitely worth looking into, and there's even a demo, so go check it out. =)

Bulletstorm (PC)

I wasn't hugely interested in this game when it first came out because the juvenile language and general attitude that I got from the game looking at its trailers was a big turn off for me.  However, I eventually picked it up at a Steam sale for next to nothing, and the game was alright.  I'm certainly glad that I didn't pay $60 for Bulletstorm, but there was a bit of fun to be had, and the trick shots were kinda neat.

Drakensang: The River of Time (PC)

It's a bit on the janky side with some minor technical issues (like an iffy frame rate), but there's a lot to like about this computer RPG.  If you're a fan of the Baldur's Gate or Icewind Dale series, I highly recommend trying this game out (maybe wait for a sale if you're thinking about buying it, though).  The battle system here has a lot of similarities to those classics, there's a lot of depth to how you can develop your characters, and the story is reasonably enjoyable for all of its standard fantasy fair.

Street Fighter IV (PC)

I haven't played many fighting games in recent years, and I'm certainly not the competitive sort when it comes to the genre, but I decided to snap up Street Fighter IV a while back on the cheap.  It's taken a while to get reacquainted with the series, and I'm still bloody terrible, but it's been a lot of fun.  Lots of new and familiar characters, the graphics are great, theme song not so much.  Decided to learn Crimson Viper for kicks, and she's pretty neat.  I don't see myself getting serious about fighting games, but I think I'd like to play them a little more in single-player mode against the CPU.  That's more than enough to keep me entertained. ^_^

Avadon: The Black Fortress (PC)

If you're interested in old school computer RPGs, you may want to check out the various games Spiderweb Games have on offer, as they are very reminiscent of what one would expect from the genre in the mid to late 90s.  Avadon is one of their more recent titles, where you play as the member of a peace keeping force in a fantasy setting where the people you work for are a strange mix between the Gestapo and the UN.  Interesting, entertaining stuff.