I'm playing Risk of Rain.

Genre: Roguelike-platformer-shooter
Graphics: Pixel art, not bad, but I've seen better. The sprites are so tiny you lose your character on the screen sometimes. The enemies often look like big blobs.
Music: Amazing!
Difficulty: Through the roof. There's a timer and it ticks up steadily, and every 5 minutes the game gets harder. If you progress too fast to try to beat the timer, you won't have enough powerups and levels to survive. If you sit around and farm items and levels, the timer will tick up to the point where it kicks the crap out of you. It took me about a dozen tries to make it past the second level. After 7 hours, I've only made it past level 3 once. That's on normal mode; I can't fathom hard mode. I went to easy mode to beat the game just to see the ending, and even then it wasn't trivial. I can see some people being frustrated with this kind of game.

But I'm having fun. There are a lot of unlockables. Being a roguelike means high replayability. The characters you unlock (once you manage to unlock any, which isn't easy) are unique and each has a very different playstyle. You can easily get a lot of playtime out of this game.

It's a good game. I plan to grind at it until I don't suck. Also I hope to try it co-op soon, that might make it easier.

PS: I appreciate people who post more than one sentence, so I can get an idea of whether a game is good or bad. Just saying...