Too late known issue: What's the connection to the theme, you ask?
There is a neat little dialogue at the end of the game that explains our thoughts but as we just learned, you can't get the ending because of a certain issue with the bloody watering can.
In short: you meet three NPCs, all of them give you a letter which together spell the word BIG. That makes Ems remember what it means to be big and so they grow tall again and are able to cross the river to rejoin their family. Yay!