everyone already said the nice things that i would also say so ill keep this to only critiques, which are not many.
1. i didnt notice the new character to unlock the first time at the store. i think it could use the same highlight on hover so i know to click it.
2. the pacing of the green zombies was strange to me, they never caught the cart the first level so i completely ignored them the second level after upgrading my horse and then they caught the cart and it was an instant lose state since i let so many build up. i think i was also expecting the cart to keep moving if they ever caught it since they seem so inconsequential the first level.