Got boring fast
I played this game for about 25 minutes and got every single upgrade and all laser turrets (the turrets work for for me, maybe everyone else doesn't know how to hit the select button?). Frankly, the game stopped being enjoyable after the first 15. It stopped getting harder. When the helicopters, the soldier carrying helicopters, the tanks, and then the walkers first appeared, they were near impossible to kill. The "oh shit" kinda feeling is what I love with some games, when you feel like you're about to die but feeling really bad-ass ass when you survive. the muzzle velocity was a good idea, it was fun figuring out the different angles you need for each upgrade. I think the power upgrades were a bit too powerful, the jump between upgrades. a balance between the upgrades seeming insignificant and the upgrades being too powerful is needed. the laser turret was a bit much too, you shoulda kept it with the three slots for the minigun and the rocket launcher. The minigun was really cool when I first got it, it was on the top slot so watching it shoot at all the soldiers and futilely try to destroy the helicopters was fun. the thing is, once you get the power maxed out, or about 3/4s up the game becomes way too easy. the only real enjoyment I got out of the game after that was maxing out the muzzle velocity and shooting into the sky, watching the bullets rain down on them like meteorites or something. Got boring fast, needs to be harder.