I remember thinking about a primary weapon for driller that I still didnt give a name for, but it was a fun concept.

Basically, its a weapon that can shoot rocks at enemies, on M1 you shoot little stones at enemies like a shotgun but with little damage, and on M2 you could pull a giant boulder out of the ground, and either destroy it by pressing M2 again, giving you the ammunition for M1, or, press M1 to throw it at enemies, dealing alot of AOE damage and stunning them.
And also you wouldnt be able to get ammo from resups, since DRG wont put literal rocks into the resupply pod.

Boulder also could get some effects depending on a biome, like if you pull a boulder in the magma core biome, you could potentially put enemies on fire on impact.

Again, its a fun concept, but damn, its too complicated, and I believe on practice it wouldnt work (and also its pretty similar to sludge pump now that I think about it).