I can see the potential in this but sadly had too difficult a time working out what to do. The controls didn't feel intuitive, and I think a few times I just wasn't able to buy what I wanted to because the menu wasn't easy to navigate. It took me many attempts just to figure out the broccoli, and i still dont know if i could have used the shop during a wave.
The pixel art is really nice and the audio was good - I think this would probably be quite fun if I had some idea of how to get a hang of it!