I'm enjoying it so far. For those wondering what it is, Team Meat said it's closest to Roguelike, and there's quite a bit of Zelda in there, too (for example, the ladder item, and one of the bosses is a more...unwholesome version of Blind the Thief). The levels are semi-randomly generated, so you should be able to go quite a while before you play it even remotely the same way twice, which is good because you only start with one life (sometimes you can get more, but one of the two ways I know of to do so comes at a ridiculous price), and when you die, you'll have to start from scratch. Fortunately, it doesn't really get hard until about level 5, but after that, well...let's just say I haven't gotten to the point where I can beat level 5 on a regular basis.
As far as the quality goes, I don't have too many problems. I've been screwed over by the randomness at times, but it wasn't anything I absolutely COULDN'T overcome. The game usually provides ways to get around that sort of thing, so if you're finding, say, a bunch of bombs but no keys, you can put those to use to find the secret room, which potentially lets you avoid a locked door. It also finds uses for any excess items you're finding. Hoarding a lot of coins? Here, have an arcade. Keeping that health bar up? Good, here's an arena so you win bonus stuff and get hurt. You did really well against that boss? Hm, obviously this is too easy for you, so here's the opportunity to sell your soul (reducing your max health) for nifty gadgets (protip: never, EVER take the Dead Cat. It's basically a lose-the-game button. The laser eye, on the other hand...)
So yeah, it's a solid game, wonderfully morbid, and with a satisfying (if a bit frustrating) difficulty. With all that replayability for $5, it's pretty hard to say no to.