Happy to hear you had fun and that it was your favourite so far!!!
Some issues with grabbing & releasing and also little guys only pooping when eating carrots seems odd to me. I've looked at my implementation, I'm not really sure why it happened. I definitely want to get that sorted out though! If possible, could you describe the situation in more detail? (you can reply here or message me on discord: boba_7)
As for the upgrade progress not resetting, that was on purpose (unfortunately I didn't get time to implement saving the actual food and poop spawns). Main reason is that I didn't want the player to accidentally return to the main menu and lose all their progress. (and I realized the in-game "menu" button is atrociously close to the volume sliders, something I'll change in the next patch).