How to make a flamethrower: Primary as minigun, secondary as flare gun, go to secondary in game, hold 'r' and then press 1 (to go to primary), then release 'r' and you have a flamethrower :D
Awesome bio combo:
Envenom 4/4, 4x on combat bar
Corrosion 4/4 1x on combat bar
Infect 1/4 (pref 4/4) 1x on combat bar
Destroy 1x on combat bar
Leading strike 1x on combat bar
Integrity 4/4
Attack a target with corrosion, then spam envenom on them, and if they are particularly tough, use infect/destroy. Leading strike will pull you out of the massive drain on focus while integrity will restore 25 focus per turn :D
At about level 22, the levels just become impossible. You have massive damage reduction, and everyone else can 1-shot you with basically any gun, even if you have a shield :(
[BUG]:
On the third level, when you go to the right, theres a single coin, then a deadly drop.
If you collect the coin, then kill yourself by jumping into the hole, you still gain that one coin. Upon reloading, the coin is still there, allowing you to get infinite money.
For some reason, I can't unlock pain-killers.
I have almost all my points invested in commando, with a few in destroyer for the gun-damage bonus, yet pain killers have not yet been unlocked :(