A thoughtful idea, but it reminds me of Blast RPG which has similar mechanics (only thing with Blast RPG is that you cannot manually control the trajectory of the weapon's projectiles

And I think using the joystick to control weapon projectile seems more like a guided missile (It'd be definitely a Guided weapon to prevent confusion) though it'll be make the mech insanely vulnerable (due to low projectile speed and manual control of the projectiles means our mech would not be able to controlled till it detonates)

I think the best way of bringing this weapon is to use these ideas in reworking Blast RPG like the Devs did with Silverthorn, a complete overhaul of the Blast RPGs, while incorporating the ideas you gave in this thread; and in the end we gat a OP version of Blast RPGs which are ready to dominate the arena

I think the only issue with Blast RPGs is the homing ability. They should remove that functionality, it would make the weapon much better.

Yes, without the homing, we can use the splash damage and deal a ton of damage to enemies

Seems great for a artillery weapon

Like a homing 10m aoe missile