Thanks a lot for taking the time to write such detailed feedback!
The point about having a bigger purpose beyond just surviving is actually something I struggled with myself. At one point I was even considering abandoning the project because I felt the core loop needed a stronger long-term goal, so it's interesting to hear someone else point that out too.
The driving-in-circles strategy is a really good catch as well. I'll definitely have to rethink how zombies approach the player so there isn't one dominant strategy.
I also agree with the feedback about the upgrades and zombie physics. Looking back, I spent more time getting the systems working than making every interaction feel impactful, and that's probably the biggest lesson I'm taking away from this prototype.
Really appreciate you taking the time to write this. Comments like these have genuinely changed how I'm looking at the next update.