Nice game, quite inbalanced though. At some point using your weapon or ability to jump is senseless. Instead, just watch your little zombie run. That's the way I did it. The weapons don't help against humans at the end and not jumping mostly keeps you out of the weaponrange of the humans. So buying weapon/jumping upgrades isn't really helpful. Just be sure to upgrade stamina, helmet, reviving (the one where you can fall in up to 3 gaps without dying) and launch.
I have to say the old menus were much better. I liked the game and got kind of addicted, but one glimpse at the new look and it's just over for me. It's too complicated and I just don't want to get used to it, 'cause the old design was so self-explaining and easy.
I think I just click by from time to time to see if I can get the old design back.
 "Back to Zombieland"){kind=icon}
 "AdVenture Capitalist"){kind=icon}
 "Primary"){kind=icon}
 "Enigmata"){kind=icon}