Absolutely amazing rougelite. Would love to see more content! If you wouldn't mind, here's two possible move ideas for consideration.
Dagger - Sword - Greatsword: Melee attacks with damage over time.
Dagger would be a horizontal swing forwards with a knife for low damage but a possible bleed damage over time effect.
This would be upgraded to the Sword, which does a diagonal swing followed by a horizontal one, with higher damage and longer lasting bleed.
The last upgrade would be Greatsword, which does a spin attack that swings semi-slowly four times total with heavy damage and knockback, with some bleed if whatever you hit survives.
Stapler - Keyboard - Briefcase: Improvised melee moves with quirky multihitting.
The Stapler would swing a stapler forward. On hit, two staples would break off the stapler and fall in random directions, damaging an enemy if they hit them.
Keyboard would do an overhead slam with the keyboard, keys flying off in random trajectories for damage on contact with other enemies.
Briefcase would be the final upgrade, with an upwards swing and a downward slam to break it open on an enemy's head, launching various work supplies out for extra damage to whatever they land on.
I hope you have a nice day!