Very cool little game!
I couldn't beat the boss but I got 9 mugs, the boss didnt seem to be able to be hit by melee which was the strategy i used for the rest of the game.
Other than a few collider issues and being unable to walk some places that it felt like you should be able to it looks good!
It was especially funny when the enemy spawns all pooled up and rushed you as you went and looked for another mug.