Nidhogg is not bad at all in terms of gameplay. I won’t go into much detail because the trailers and such pretty much show what it's about, but its damn fun to play. The combat has a lot of options and things going for it and nicely juggles both complexity and ease of learning. The music and visuals match and mesh with the feel of the combat excellently. I can easily see how co-op can be a blast with friends, or the tourney potential.
So why is this not recommended? Because the devs cared more about the game’s style, raw gameplay, and media hype then its long-term substance or support. You’re playing this game and having a lot of fun, and then before you even hit the one hour mark you find yourself thinking “that’s it?” and then it’s all downhill from there. Singleplayer consists of you fighting a dozen or two progressively harder AI opponents, however the stages start looping after opponent four. Yep, only four stages. There’s no story to speak of or even an attempt at one, and once you’re done with it you’re left with nearly nothing else to do with the game. Multiplayer is dead, D-E-A-D. Its features are minimal and in terms of functionality the MP barely worked when the game came out, and then because they never fixed it people gave up on it entirely so there’s no one playing.
This game deserved more support and more features and updates from a solid company. But because it didn’t get that and most likely won’t ever, I am sorry to say that charging $15 for this is broad daylight robbery and I cannot recommend it. Only buy this if it’s on sale, and with the understanding that outside of being a weekend distraction or occasional hour of fun with a friend this game has no value.