I really liked this. The atmosphere is done well, the story/premise(idrk, im illiterate) is set up nicely at the start.
I do think the turrets need to have a longer reload time since they're the hardest things to deal with, or I'm just not very good at top downs.
For the infected I don't really feel like they're fast enough since you can kinda just walk backwards and deal with 'em really easily.
Overall though, really good game.