Runs good on my machine too. But i got an i5 3450 @ 3,1GHz and a GTX 970. So it would be sad if not x)
The game itself is fun. I hope you add more variance too it. At the moment it gets a bit boring while playing
a round. Played one time on Normal. Survived 16 Waves.
I guess you already know about the invisible enemies. Standing still always results in getting damage from them.
The other things:
The mines, aren’t they supposed to explode if an enemy runs over them? Because they did
nothing at all. I planted the whole map with them and tried to kite the enemies over them, but nothing
The doors button seems to be a bit overpowered. Planting 2-3 Turrets in this room and closing the doors will
let you survive a wave easily (if there weren’t those invisible enemies).
The minigun is horrible and the sniper feels like a shotgun with a scope.
I also managed to break the minigun. Normaly it starts a bit slow and gets faster (till it reaches this
total annoying sound and feeling for me), but when i clicked multiple times instead of holding the mouse,
the minigun took ages to get back to fullspeed. It started way slower than before and felt like a
double variable needed to come back from 0 to the default value.
So, i hope this helps you getting some bugs out of the game. Looking forward to it.