Looking at this as an actual game... at the hub-world you've got a lot to do. affection-farming via gifts, VN-style event scenes, minigames.
... But the actual core gameplay of fighting zombies kinda sucks? The controls on controller are ass, there's some kind of fucky aim-accleration going on making it unusuable.
On keyboard it's fine, but unimpressive.
Mostly there's just no feedback, half the guns feel bad to fire, and your starting gun is trash.
There's an upgrade system, but it doesn't feel like it actually does anyhting?
Like, there's upgrades to have more max health (you don't lose because you run out of health, you lose because the girls die) have more ammo for your primary weapons (they rarely run out anyway) or to improve your default pistol but only in ways that don't matter.
Maybe the revolver or cyber-gun upgrade will be cool, but it looks like I need way more exp for that, and the combat is bad enough that I don't want to do any more levels, tbh.
The default pistol can't kill a regular zombie on a headshot. Feels bad.
You can upgrade the mag-size or reload speed, but there's no upgrades for damage, so they're useless.
You can pick up a lot of tiny incremental upgrades like 'more health' and 'better punch' and 'pistol reloads slightly faster' that feel like they should add-up to something noticeable when you stack them all together... but perks don't do anything unless you equip them, and you can only equip like five, total.
They had potential for something cool, but wasted it.
It doesn't feel like I'm getting stronger at all. None of these perks have given me any noticeable improvement.