Recs.
Updated
SpecsUpdate
Pros
Pro Lots of options for different skill levels and play styles
Characters such as "Bard" provide an easy mode without making the game feel lame. Other characters provide an extreme challenge for more advanced players. Lots of different weapon and armor combinations keep the game feeling fresh and support different play styles. Players also respawn after each level, meaning a less skilled player is rarely out of the action for too long.
Great tutorials for both basic and advanced strategies. Good difficulty curve.
Pro Unique gameplay
Crypt of the NecroDancer is a rhythm rogue-like dungeon crawler. All actions can only performed on the beat. Adding rhythm as an element to a dungeon crawler allows having each enemy move in a different patter related to the beat and interesting powerups such as tempo increases.
Cons
Con Be prepared to share
Coop requires players to share money and items, which can leave two under-equiped characters instead of one well equipped character. Players also share one screen, meaning they need to agree on which general direction to proceed in. Going in different directions can cause players to get stuck or attract multiple groups of enemies. Players also share one beat counter, making combos harder to achieve.