Since when are jam games so well polished? I remember a time when jam games looked like shit and played like a nine year old coded it, following a tutorial of wich he only understood half because the tutorial showed an older version of unity.
This however feels and looks like a finished game! Heck, there's even a little cutscene at the beginning. It's not much but I would 100% believe it if you told me that this was not a jam game.