TL;DR: Really good, needs more satisfying effects. I realize that probably stuff is missing so I did not focus on that too much.
Ok so actual review:
I kinda disagree with MartinArthur's point about the combat in the hallways. I actually find it engaging when I run into a hallway and a guy is shooting at me, so I have to backpedal, lure them towards me and then shoot me. But yeah maybe the level design could be better, idk. Not a game designer.
For me, this game is really good and what it needs most in my opinion is polish. I already love the blood splatter and the fleshy death sound effect. But the guns need to sound more punchy too and in general I still feel like theres room for improvement in this entire juiciness department.
Also I felt like a teeny bit more healing items would´ve been in order, cos I was constantly upgrading my health, to basically heal.
Oh yeah, when you hit enemies and when enemies hit you - this could also use some visual and audio feedback, again, something juicy. Cos right now Im never sure if I do hit an enemy or if they hit me.
Other than that I find the game really good. I actually enjoy it because its just simple mindless walking and shooting at guys, which is quite relaxing and satisying.
I also appreciate how much was done with the art direction, with little textures and simple lighting. Chefs kiss.
I know that a bunch of stuff is missing such as the ammo indicator, or the ability to look at controls while in game, or whatever else, but I know that that's coming. So I gave this feedback more in terms of the juiciness which I personally would desire. Think the juiciness of Diablo. MMmMmm yummy.
Also, exploding barrels would be so cool. Or mby they are there but I didnt get to that level yet. Idk, writing this while still playing the first level because its quite big. Maybe the levels are actually a bit too big for demonstration purposes. I'd make them smaller if you want to efficiently showcase ALL that the game has to offer. By efficiently I mean in a reasonable amount of time, think of the end-of-school-year demo and how little time the average joe there has to play.