This is a strange.. I guess you'd call it a non-linear Platformer.  Weapons have limited durability, but you find so many of them that you won't likely run out.  The aesthetic is like... Dark Christmas?  What's really neat is that you keep going deeper and deeper into this dark world, as it twists and warps before you; it reminds me of one of those old games like Adventures of Star Saver on Game Boy.  Highly recommended!