Very well done, just like some of the burgers I served ;)
Chaos + restaurant kitchen go hand in hand. Having spent a good amount of time working in restaurants, this felt like a natural fit and boy did this not disappoint. The gameplay is the perfect amount of stressful and frantic without being overwhelming or too easy. And that audio! The music is kinda whatever, but its low background droning is the perfect display for all those nice cooking and kitchen SFX. I immediately was taken in my the sizzle on the main menu. Very well done. And all of this on top of lovely pixel art. A+, great job.
If I had to point out some things to improve, it would just be some more polish on clarity. Having some sort of visual/audio indicator on when a burger is done cooking might help train the player to always be checking those, especially for the first few orders. Also, having a more clear "submit" area and button. I actually lost my first few attempts because I didn't realize I was throwing away my burgers. I thought the "area in the upper right" referred to that little tray. My mind thought "oh, that must be like an order tray. Ok, cool." But that didn't seem to accept the tickets. I figured it out eventually though.
Great job, keep up the great work!