I think this is a pretty good game. I do, however, not like how it's just the same thing over and over. I found it strange that the enemies all looked the same. It still gives you a nice amount of mobility and you have fun shooting them. It cost $5000 to just equip something new? That seems a bit high.
It is fun to keep on doing this. I like how the zombies make this "ooo" sound when they fall down. I thought the roman numerals in the title were exclaimation points. There's another game that does have that in the name. This was fine for a quick little play.