Fight zombies

This is a small leisure puzzle game. There is a constant wave of zombies in the game. Players manipulate characters to kill zombies and persist in the game for 10 minutes. Players will lose experience after killing zombies. When they gain enough experience, players can upgrade and choose to upgrade their skills. There are multiple combinations of skills in the game, and players can choose freely. There are various kinds of zombies in the game and powerful heterogeneous zombies. Come and challeng