Hi ! Thanks for the very nice feedback :D
As for the items, that was on purpose: those are non-mandatory, hidden veggies that you can find if you want to try to get the biggest poop-score you can. Maybe I should find a way to guide people to it a bit more. The lamp-posts, lanterns and candles turn black because you turn them out of their veggie-magic by stealing the veggie that powered them (because in guinea-pigs world, veggies and fruits are magic :p)
Well done you've found them !
(I have opened your game in a tab, I'll play it today too)