Well worth the purchase. This game really puts its own spin. It's definitely a roguelike, but it's got a lot of fun little twists in there that make it feel very different. And for all its fluffy exterior, this game can kill you dead in like 5 seconds. You'll get cocky, sidestepping traps everywhere and doing awesome things and finding items that split the earth in two, then a spell will backfire or you'll get stuck with some sort of enemy or situation you aren't too well prepared for, and WHAM. The sense of humor is great, though, and really encourages replaying. I've run into a bunch of really funny stuff so far, some of which isn't just raw humor. Like there are interesting rooms and shrines, weird usable objects, stuff that's not just a sight gag or a funny item description. Also, there are tons of game references. The monsters talk sometimes, and I about died when a group of bats told me "there's strength in numbers" (there was like 6 of them, it was terrible), another said "you're terrible at this", and a third one, right before it killed me, said "you n'wah" (Elder Scrolls gag).
I don't want to spoil half of it. Everyone should grab this!
EDIT - Haha, Clerks reference. And I want to spoil so much about the lutefisk.
EDIT x2 - This game has destroyed my productivity with extreme prejudice.