Congrats on your first game jam! For your first one, this is really good and has a nice amount of polish. I like the mechanic of the game, it was really fun and would fit nicely in a four player party game.
If you wanted to improve, I suggest making a simple AI for the player to play against (just program it to stand the nearest place where it can get a ton of points). I recommend doing that as it's hard to play multiplayer games alone during a jam.