The 'Maplevania' name comes from the game's visual style, which mirrors that of the Maple Story games. In other words, all the characters have a 'superdeformed' style, with big heads and big eyes, but small bodies. The result is a cute and fun aesthetic.
Maplevania's gameplay is very similar to any traditional beat'em up. The only problem in this sense is that the characters have a very limited range of moves. In most other games like this, you get a range of button combinations to pull off special attacks, but not here.
During the adventure, you'll get to see lots of different enemies like zombies, skeletons, bats, and ghosts, all familiar to the Castlevania franchise. And at the end of each level, you get to fight a 'final boss'.
Maplevania is a traditional beat'em up game that despite being a bit limited is still fun thanks to its entertaining graphics and simple gameplay.