The framerate is definetly not your fault. All 3D games in this jam are very slow in my PC. I tried to run your game again in low resolution but I didn't help.
But since you are interested in my feedback, I will try to play your game on my friend's PC, it will likely run better there.
It is not easy to take criticism on something that takes so much time and effort like making a game. Good for you being open to it!