Why does the download want to make changes on your computer? I downloaded it but when the computer warned it wanted to make changes I stopped and deleted it. I use Unity which doesn't as far as im aware make any changes to a computer when you open its sandboxed demo application - i'm paranoid i'm a web developer.
Graphics look fun though, I like old style simple games where your not under the pressure of multi player frenetic time constraints, just you and your imagination on a rainy afternoon!