I have a about an hour or two in this game, but don't let that discourage you.
GAMEPLAY: Niddhog has very good gameplay, easy to learn but difficult to master at its finest. You hold your rapier in three positions, low, mid, and high. You can strike from any of these positions, and if you hit your opponent who is at the same guard as your attack, it'll be parried. Moving your blade up/down onto your opponent's guard will also disarm them. You can throw your rapier, do a jump-kick, and do a sweep while crouched. You can also roll on the ground, which has the implication of rolling under a high-guard and getting behind your opponent. Overall, the combat is good. Also, each unique stage has special areas and can be used to your advantage. Such as the cloud level where you can fall down if you don't move.
GRAPHICS: The graphics, although "pixellated", are aesthetically pleasing. However this is where the game starts to fall. The second "cloud" level, is very, very bright and flashes very fast. I'm not epileptic, but I was straining to see in this level and I have no idea how an epileptic would deal with it. But otherwise they're good.
COMMUNITY: Now here's where the game falls apart further. It has a good, active community. However this is useless as the netcode for the game literally doesn't work. There is no online play, so you can only play locally/LAN. A game that'd otherwise have a very long life is made a gimmick because of this. There are no multiplayer tournaments, matches with friends, or community events. In this sense, the game's simplicity kills itself as it doesn't last when playing alone.
The game is good, but I can't recommend it. Due to the non-existant support post-launch, the broken netcode, and lack of news about the game gives it a bleak future.
5/10, good game but it's average.