Hey man, Thanks! I really appreciate your feedback.
I have to confess that I don't actually like the animations, I did some walking animations, but I couldn't export them to unity, so I ended up doing those animations.
About the SFX and music, yes I have to get better at making them 😅.
About the difficulty curve, well the idea is basically that you have to try to get big combos, but if you acumulate too many shooters, they would easily kill all your zombies. Anyway, you're right, I have to refine it.
Greetings from Argentina! I really like your videos, and your game for this jam btw.