Thanks for the report!
I know the game crash when you go back to main menu and the simulation is not finished, it's probably that.
I'm using delta time everywhere, lag should not impact the game. Maybe there was 2 fruits on top of each other, that's why the entity didn't die?
Thank you for playing and glad you're enjoying the game! There will be no early access but probably some public/private playtests. If you want to participate, join the discord server. (There's no channel for simultree yet, I will create them this week when I'll officially announce the game)