Good fun, but impossible to finish.
The graphics are pretty dark and not excellent, but they are something you get used to. The sound effects are cool and the zombie variations are many and keep coming at a steady pace, aswell as the new guns which make a nice variation.
All in all it's very fun and the bathroom, bedroom and rightmost corridor thingy breaking the otherwise square design of the house are excellent - and I was forced into the bathroom more than once.
Luckily I wasn't damaged until a crawler spawned on me right after the runners had started appearing and I didn't have major problems with the boss - but two zombies have spawned OUTSIDE the map and thus can't be shot = I can't finish the game. Pretty sad. I also noticed some zombies just standing around doing nothing until I shot them, which is rather unfortunate. Otherwise a great game.