Excellant!
One of the best defensive games I ever played, the only thing I found annoying was the fact that the time between rounds seemed to double ever other round, also Its difficult when you only have $750 income and your repair bill from that particular round is $722 overall a good game, I especially like the sudden high hitpoint events like the bombers or the Missle launchers, graphics are very good, and the actual variety of low to high strength enemies is very impressive, at least worth an 8 in my opinion, you would have a 10 if it had some music, instead of the insessive amount of gunfire