This game has good graphics and audio and feels well presented. Movement is nice and smooth! The concept of the game is very interesting: it's like a restaurant where you have to fight and kill your own lunch :-)
I made it to the first cooking station and met Mario the Dwarf, where he ate a burnt stew made from dead Mushroom Man. Mmmm... yummy! ;-) Sadly the stew wasn't very nourishing, as we all died of soon after :-(
For a 9 day jam I think you implemented a lot of functionality. The most important additional thing to implement would be a map.
Re performance, I use Linux on a basic office-type PC with integrated graphics, and I successfully ran the browser version of your game using Chrome, although CPU and RAM usage were both maxed out. Hope that info is useful.
Thanks for submitting to the jam!