Ok first of all the visuals and aesthetic are incredible, the black and white and the filter making it look like an old horror movie?? Perfection.
The gameplay is pretty decent, I'm enjoying it and so far the progression feels mosty well balanced!
I have noticed an issue with the runners in that they oftentimes aren't actually any faster than the shamblers? I thought they were entirely bugged until I had one actually running ahead, while simultaneously having another that couldn't overtake the main shambler hoard. This also makes the Runner Rush sigil unreliable as I have no way of knowing if it'll spawn useful runners, or if I'll be wasting my contagion points.
Speaking of contagion, I really like that mechanic, it's great to have a resource that is only for that run, meaning I can spend as much as I like! With the brains and flesh I need to weigh up spending it now or saving it for the next run (Which is also good! Having both types of currency is good for variety :D)
There is some confusion in the wording, namely upgrades saying "X per level", and I wasn't sure if that meant per zone? Like if passing each zone in a run levelled up my zombies, then I realised it probably meant per level of the upgrade? I think it'd be clearer to just say e.g. "+10% health (+30% currently added)" or something along those lines!
It'd also be useful to have a graphic of each human character when talking about the types, as it leaves me guessing which one is which :0 It'd also be great to have a little notebook or bestiary of the human types to more easily reference them, as currently their pages are buried in all the other tips and new upgrade popups. Perhaps a notebook with the human image on one page and their information on the other? Just an idea!
I also wasn't entirely sure if the "total health" for each zombie type meant all the current units added together, or the health for a single unit. I'm leaning more towards the latter but that is another thing that could benefit from clearer wording!
It'd also be nice to have a slower scroll for the upgrades, as currently scrolling goes far too fast to comfortably navigate the list! There's the same issue with the sigil list, but with that one you also can't even click and drag making it even harder.
Also "Best Zone" made me think the highest zone I'd reached, making me think it'd bugged when it didn't update when I hit Zone 5! Turns out it means best zone completed :p
For one last quick suggestion, it could benefit from a dedicated pause button! Thankfully it is possible to pause by going to the glossary, but that is a few clicks, so a specific pause button would be a bit more fluid, but it isn't exactly a big deal if not!
But yes I really am enjoying this and again I adore the aesthetic and visuals, the characters all being black with a pixel outline really fits the vibe as well as being visually simple to avoid being too visually busy when there's lots of characters on-screen! I also really like that all the silhouettes merge together with just the single outline rather than overlapping outlines, it's a small detail but it does a lot!! Overall this is a very neat game with enjoyable gameplay, great job!! :DD