This is a really cool idea that is super smart!
I love the negative feedback loop that comes with winning a new piece of the burger, it gives the other player a better chance at catching up. And because your burger get’s taller (or longer? IDK), it means that in the later parts of the game when both sides have gotten many pieces, the burger actually makes it harder to hit it back to the other side, better solidifying who wins the game. Perfect party game design!
I could see this being turned into a four player game, one were people could play horizontally.
The initial controls (even with no burger pieces) is very slippery and sometimes uncontrollable, but other than that, really smart and fun!