What a great game! You managed to pack a lot in for this short jam. I loved being able to pick my favorite guinea pig at the start- you don't see that every jam. I could see this being a great, fully realized puzzle game if you put in a little more time to the art (and more levels). The amount of polish was great- I loved the availability of options for things like sound, controls, and so on. I think one area of improvement is to have the mood displayed in the corner at all times. I know you put in an option in so I could check it, which was smart, but I think an always-on HUD element would have been a better pick.
If you want to continue this game, here are some additionoal features you might try:
-add on some kind of enemy, like maybe a rival guinea pig that eats what you want at the same time you do.
-Or, you could make it so the pig's mood might change mid-level! You could have the moods cycle through a preset cycle so that you'll still need all the mood types to solve the puzzle, but might need to backtrack a bit per level.
Overall great game! One of the most fully realized ideas I've played across all the submissions.