You are very brave for making a 3D game for such a short game jam! You managed to pull it off though and I think the game is quite fun(if a bit short).
If I were to update this game, I might add some more gameplay variety to the 3D section(perhaps there are some enemies that damage you, or some that are worth more) and make the 2D section ramp up in difficulty over time a bit more.
What you managed to accomplish though is very impressive, speaking as someone who tried and failed to make a 3D game for a game jam. Good job!