I think that maybe a third weapon idea would be nice to have some sort of club that if you hit an enemy it would stun them and maybe some upgrades for the sword for further levels like maybe being able to cut through mk 1 and mk 2 sword robots swords or cause oil spill (bleeding for robots) or the club being able to have upgrades and maybe knock the opponent's sword to the floor.

Or what about an upgrade that lets you use the sword to knock the enemy's sword to the floor?

Fun ideas. Disarming opponents without cutting off their arms might be fun!