Upgrade system is fun, I like how there's a permanent progression in addition to the current run-only upgrades. I think the pixelation is a little heavy-handed, it's hard to see anything because of it. The zombies are so fast!
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I will say I think you're right about tje pixelation, One thing I was debating on doing but didn't have time is having the enemies be 2d sprites on a worldspace canvas and have it bee kinda DOOM 64 - esque for the style. I do think the zombies maybe should be a litttle slower but I also like the speed... maybe more enemy variety with a slower and a faster variant ...