Crypt of the NecroDancer is a hardcore, roguelike 2D action-rhythm game.
Pro Unique gameplay
Crypt of the NecroDancer is a dungeon crawler that is also a rhythm game. Your character can move, attack, and use special abilities only to the beat of a level's music. This means you have to split your attention between listening to the music and watching enemy movements. If you miss a beat your character won't do anything, but your enemies still get to move and attack. While the enemies are bound by the same rules as you, they won't ever miss the beat. Fortunately enough, they're always bound to a rhythm, so learning an enemy's rhythm is the key to defeating them. As a result, the gameplay stands out in both the roguelike and rhythm game genre.
Con Co-op can make the game a lot harder
While Co-op in most games makes a game easier, Crypt of the Necrodancer is the opposite. This boils down to three main reasons.
First, you and your co-op partner have to share money and items. This can lead to two under-equipped characters that struggle with killing enemies and surviving their blows.
Second, there's no splitscreen, meaning your movements need to be in sync with your partners. If you happen to go in the opposite directions, you can get stuck or attract multiple groups of enemies, causing you to get overwhelmed.
Third, you share one beat counter with your co-op partner. So if one if you misses a beat, that's the end of a combo for the both of you. Not keeping up a combo means you'll have less gold and consequently less gear.
Con Extremely hard
The combat in this game has an insanely fast tempo, requiring you to split your attention between the music and the on-screen enemies. Losing focus even for a split-second means you'll probably die, so you'll have to restart the level. At times this will feel really overwhelming, especially if there are many enemies around.