Crossing Backpack Battles with a race is a creative pitch and unlike anything else I've seen in this jam. Managing your inventory as if it were your racing build is a good hook. The menu palette (bubblegum pink over petrol blue) with the rounded font looks friendly and readable, and having a Continue option suggests there's saving and progression in there.
Unfortunately I couldn't start it. I clicked New Game several times, tried double clicking, and the menu never responded at all.
I think I know why: the game window is much bigger than the screen. The whole menu is squeezed into a small card in the bottom left corner and the rest is a huge empty blue area with a horizontal scrollbar at the bottom. That mismatch is very likely what's breaking the clicks, since the clickable area probably isn't where it's drawn.
Practical suggestion: re-export the WebGL build with a resizable / responsive canvas and test it in an 800px window. As it stands a lot of people voting in this jam won't get past the menu, which would be a shame given the idea.