Click to attack Space to block Block just before an enemy hits you to parry, this will stun them and you will do 50% extra damage. Left and right arrow keys to go previous and next waves. R to restart wave. Click the sword or shield at the top to upgrade them if you have enough money. Each shield has better blocking % then the previous one, and gives 10 max hp per one. Red bar is health Green bar is stamina, which is needed to attack and is used up if you parry successfully, regenerates slower when blocking.
Sounds from Freesound.org and Scratch. I made the scratch cat, the weapons/shields, and a few of the enemies, the rest are modified scratch ones.