Hey nice game, i did notice some performance drops which i assume is because of the grass one way i fixed this in my godot game is turning on backface culling for the multimesh.
Thank you. I will try to improve the performance, I will see if I can back face cull the grass shader as a quick fix. Unfortunately we ran out of time and optimization is usually one of the things I do to refine a game. Thank you for the feedback.
Haha i had that same problem, its i real issue with godot for example on my game i have every optimisation setting under the sun turned on and it still would either be at 200 fps or 10.