The game looks good so far! I like the mix of different genres, however, I feel like if you were good at the game, you would find it too easy. You probably have a mechanic that tells the game to increase the difficulty for each wave, and that's good! However, to add more variety, I would put in different types of zombies, like a small but fast zombie, a slow zombie but is a pain to take down, etc. I would also work on the UI a little bit. Looks kinda bland. Other than that though, I feel you've got a solid game my friend!