I learned I am still a stupid old man, making weird games that no one really seems to like playing. But who cares. I still have fun making them.
Okay to be a bit more serious, I'm not sure I learned much new developing the game. But like Nym-Phi mentioned, that by seeing what all you amazing weirdos makes is really inspiring. And I from them I still learn a lot about what to do and what not to do.
And if nothing else I got reminded that I like the 7 day jams better then the shorter 2-3 days jams. But like I already have mentioned I'm pretty stupid, so my next jam will most likely be a one hour jam.
Anyway I hope you all have learned something, you can use for your next game.