Well....
First off, this was really fun. However......
1) Repetitive, but I'm okay with that.
2) Terrible A.I.
3) The game you're advertising is 3.D. unlike this one, so they're unrelated, thus, this isn't a demo, rather it's an ad. It was unneeded.
4) The upgrades are too expensive.
I'll give it a 4/5, 'cause I'm generous.