Summary
A frustrating gameboy experience
The Good
The game handling is quite good, the top-down perspective works very well for this shooter. It is also a nice idea to have two characters, between which you can switch. They don't differ in ther abilities, though.
The Bad
Fortified Zone gets extremely unfair over the game. Since you're not allowed to save and I don't remember if there is a password function, you are sure to spend hours and hours in front of the tiny screen.
I also didn't like the setting very much. The rather strange alien/human enemies mix-up has not really a storyline behind it
The Bottom Line
Fortified Zone i a top-down shooter with rather good graphics and an innovative character switching option. On the other hand it is rather frustrating. You might want to try it out, if there are no better games left to play...