Nice work. I find its, simpler the better with games. The concept is really good and is actually a great one to use as a way of changing the difficulty for players dynamically that you could use in other games you play too. Great stuff!

If you have time, I'd love for you to give my game a go :)

Sadly the WebGL version doesn't load.

To fix this open unity (like normal) Then File - Build Settings - Player Settings - Open up the Publishing Settings - Go to Compression Format - Change the format to Gzip