man! this was FREAKIN' GREAT!!!
for those new people that are reading this, heres how i got through the first 30 levels:
-get a machine gun sentry and upgrade damage
-let it blow guts for the first five levels
-purchase a shotgun (you can get one by clicking on your guy while equipped with the remote)
-upgrade capacity
-blast away with the sentry
-once you reach level ten, you should have enough money for a few decent upgrades
-purchase rate of fire upgrades for your sentry
-continue firing at the boss until it dies
-purchase rate of fire and capacity upgrades for the shotgun
-shoot away for the next five levels
-get some reload speed upgrades for the shotgun
-purchase a second turret
-upgrade damage and firing speed on new turret
-blast away till level 19
-on level 19, purchase floor spikes and uprade them. youll need about 700$ for a level 3 floor spike
-kill the boss on level 20
-upgrade shotgun reload speed and damage
keep blasting away till level 27
-on level 27, get a grenade launcher sentry and upgrade firing speed and damage
-shoot away for the next 3 levels
-kill the boss and collect the bounty
WARNING: THIS STRATEGY MIGHT NOT WORK 100% OF THE TIME, IF YOU USE THIS STRATEGY AND YOU FAIL, THEN DO IT YOUR WAY. THIS IS JUST A WAY OF HELPING THE NEW GUYS