This feels so nostalgic. I had some issues with the first time a shader is rendered (like the meat explosions). I tried to see if downloading it helped but no dice. I know this is part of the Godot experience though. You can try and have all those effects, particles and shaders render behind a viewport in your cutscene to have it prebaked.
Otherwise amazing. Crunchy, and I love the amount of voicelines. This was really fun.