The shotgun feels alright up close. The alt-fire is absurdly powerful and a real workhorse I adored fiddling and playing with. Like Blood's dynamite except it has an instant blast range and it goes through walls. The chainsaw felt weak and the flamer would probably be great for stationary or bulkier enemies. Creating walls of fire enemies have to go through is a cool idea and I would wish the visuals of the flames to jut out sooner and do a lil' bit more damage. Alt-fire slowing down time is pretty neat.
I've really adored COD's zombies so I feel pretty good with looping and training in enclosed spaces, however, some people may hypothetically find the close quarters with some beefy zombies a bit challenging.
The ground pound's great. Entering the first room, nuking the first wave with the alt-fire, and slamming the second wave feels pretty good. You can just fuck their shit up and send them flying, feels pretty neat!
I think you have the enemy spawns on a timer, and if so, I beg of you to leave a bit more breathing room for them before they spawn in since sometimes you clear out a wave, and another spawns right atop of you, mainly happens in the first room.
Has that Unity thing where your collision box refuses to let you enact your downwards velocity since your movement against a slope cancels it, leading to you generating lots of downwards velocity since you aren't on a floor, but still not going down because you're on a slope. This leads to you feeling "sticky" on slopes that can snag you up during sliding and moving. I mainly got this "sticky stuff on the lips" atop of the spiral stairs.
Alt-fire slowing your sensitivity feels funky but I sorta think it's cool for the shotgun since its alt-fire is so powerful and you're charging it up at lower sensitivity so you gotta commit, feels pretty good on repeat levels when you know where spawns are but I wonder how it'll feel dynamically either way, it's a neat feel given how powerful the alt-fire is.
It's pretty cool! Keep it up!