Fun twist on a classic tower defense game. I like that you try something new, and you’ve been able to add a good variety of content and levels. I also appreciate the tutorials. I won
Adding keyboard shortcuts to select the type of zombie (e.g. 1,2,3,4) would help make the game easier to play. I also think the players move and die too quickly, and the game becomes a mouse clicking game. The faster you click, the more skilled you are. However, making it slower, and maybe add some extra tactical elements in both placement and which unit to use would help elevate the game. All in all a good concept, well done.