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If you want costructive criticism, here it is:
1)Nothing wrong with buying assets from store, but you can atleast move them around and create new levels, not just dumping demo scene into the game. These demo scenes supposed to showcase models, not for gameplay, these are not finished levels with beginning, middle and end.
2)Your zombies wear jeans in medieval times. Atleast find medieval zombies, or more appropriate enemies like orcs or skeletons, and teach them to block or dodge to make a combat a little bit more interesting then just clicking enemies to death.
That is fascinating. How long you working on this?
Looks very impressive. You made all this enviroment yourself?