This was a really well made game, that I'm glad I was able to play!
The core mechanics are really fun, and the game did a great job at easing the player into it. I could definitely see myself playing a "full" version of this game.
My only criticisms would be that I wished placing enemies was handled a bit differently (it felt wonky), and I wish that Coins were actually collected, and that the Hero used them in some way over time.