This has potential! I love order management games like this, and the fact that it's sushi-themed makes it even better. But there are a couple things that irk me. They're very minor.
The first is the fact that the diagonal pieces feel like they take up more space than they should. Even when they aren't touching, or are even close to each other, they refuse to be set down next to each other.
The second is minor, but the "ghost" showing where your sushi will be placed does not line up with your cursor. This throws me off because I use my mouse cursor to aim and place.
The last is a small visual thing, but the font you use makes the DELIVER ORDER button look like it says DELIVER DADEA.
But I really like this! The music, the models and the colors are all lovely. You made it all yourself during the jam? Hell yeah man