Well my suggestion is having abilities, like you can do triple shot, or circular swing with your sword. You can only pick 1 or 2 of these abilities per weapon. also uses bars of energy, depends on the ability.
360 Degree Swing: I find this one fun actually, you know the part where you go slow motion if you kill the last bot? you can do a full spin and hit the enemy twice, and I've been doing that a bunch of times and it's fun slicing them to pieces. 2 energy needed
Great Slash: Better vertical slash, making them unbalanced while also a chance to trip them to the floor. 1 energy needed
Thrust: You charge and you thrust forward with great speed, yeah. 1.5 energy needed
Double Shot: fires 2 arrows at once. you can choose what pattern, like V or II. maybe more pattern, 1.5 Energy
That's all I have for the bow, maybe split shot, but too op I guess, (basically it splits into 2 smaller arrows as it hits an enemy)
Smash: Jumps and then smashes the ground with great power, to create a small shock wave that stuns enemies. 2 Energy
Swing: Charges the hammer to swing it with power, you move slowly, consumes 20% more compared to jetpack.
that's it for hammer, ran out of Ideas for bow and hammer.
Repair bot repairs the parts you lost, so I don't have to exit the game and come back just to fully repair myself because I lost a leg or an arm.