100% Achieves in ~100h.

+ the mechanics are very friendly, the game can pull you for hours and you won't get bored of slicing undeads or gremlins too quickly,
+ the graphics pleases the eye and allows you to play also on older machines,
+ not really p2w, almost 100% of the things in the game can be easily achieved without them,
+ (for grinders) a bit slow collecting money for further upgrades, but after reaching the 9-3 rank, you only need to farm the boss called Vanaduke a few times and life becomes better.

About music.. hmm I guess it's kinda atmospheric but I didn't pay much attention on it when I was farming Vanaduke.

www.youtube.com/watch?v=tRRpLF-Z6C8&t