We have added a sword to the vendor which has the following attributes:
Cost: 150 coins
Base damage: 50
Damage scales with time to make it relevant throughout the whole game.
Combo multiplier increases by .1 up to a maximum of 2x multiplier which is achieved at a combo of 10.
This is our first iteration of the sword and combo-building mechanic so we may be making large adjustments in the near future.
We're looking forward to seeing how high of a combo you can achieve by causing damage in style!