Nice tower defence! I loved the inclusion of the tutorial. Well done!
Suggestions for future improvement:
- Make the background and the paths a bit more distinct from each other. I found it hard to tell them apart, and placing items down was a bit more of a guessing game.
- Change the coin location to the upper right corner of the screen, or place it entirely differently from the item selection table. I often forgot how many coins I had to spend because I kept thinking they were part of the item selection.
- It would be nice, I think, to be able to collect the coins in the middle of the round so I could buy and place items as the wave went.