lets see... you MUST pick up money, which WILL disapear very quickly after it drops AND you don't get any money if you lose AND you can't replay levels until you beat the game.
Basically, if you want the best weapon in the game as soon as possible, you gotta suffer through many levels with crappier weapons to save.
I would enjoy this game if it weren't for ninjas, ninja bosses, especially. It's not a fair thing to add to the game, when mistakes can mean copious amounts of time to retry the level, which lowers the overall enjoyment of the game.
It really frustrates me when a line of cars go by, and kill literally all your allies, since they die in one hit, unless you use your skill at a specific time. I like the concept of this game, but some parts such as those cars, really ruin it for me.
XD