Couple of things:
I feel ur frustration. A lot of things should be adjusted for sure.
You can roll past knocked down zombies.
Spam jump kick to jump over crawling zombies or dogs.
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Wow I didn't know the dodge worked like that, thanks for the advice. I never made the connection because every time i dodged it was on accident and it immediately got me GMed. I also didn't know you could jump over small zombies because I tried to jump over a trap yesterday and still got caught. Again thanks for the advice : )