The tesla weapon is a little bit to overpowered. It use not much ammo, high damage, the high reload time does not matter, you kill all enemies on the screen with one shot...
PS.: The enemies are too weak.
good game, although my pc is to weak for it. I always play with matrix style. Has some benefits, but is annoying after a time.
PS.: Weapons have only limited ammo. You have to collect this weapon for more ammo. You can't reload your weapon by yourself, this is done when you are used the magazine.
I prefer the rail gun. Less ammo, I know, but very strong and can hit more than one enemy.
Really easy. Don't spend your money to early on the low upgrades, if you buy the higher, you safe the 400 exp for the low.
After wave 19 (I think) I had all upgrades and 3 2k turrets.