After some time playing, I noticed the bee mechanic can become overpowered with such setup :
//The mag that regens ammo//
Shotgun shell [more bullets less damage]
Reversal stock [shoots behind]
Sticky grip [Friendly bees]
Sticky trigger [Friendly bees]
Triple barrel [3x projectiles +2 ammo per shot]
In short, there's a probability for one bee to spawn every bullet shot. I equipped 2 bee items to rise the odds, then I chose the remaining parts to fire as many bullets as possible in 1 shot
And so, each shot casts a swarm of bees that can easily anihilate each stage / boss, no matter wall or aim [Although it severely slowed down the browser version]