Touch the well to collect water, then go back and talk to the flower. After that, go into the house and collect the acorn.
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Oh, got it now. It didn't show the interaction symbol and when I was trying it before I must have been outside the area. I like how minimalistic the game is and how you used all of the special skills in the boss fight but after I finished the boss fight (my character froze so i suppose it was end) the ant went to me and screen went black. Don't know it is intentional this "dark" ending. I also encountered this bug where if I jump right before triggering dialogue, the character flies away :D I think you are keeping the y speed in dialogues or something, check that out.
Edit: I now found your comment that explains the dark ending is in fact a bug.