Oh It definitely surprised me! I also struggle with never finishing projects, but mostly because I bite more than I chew and end up designing games that I'm just not capable of making yet. Even when I sit down and try to design a "small achievable game", it ends up being out of my reach.
What surprised me the most about the game jam was that I managed to design something small and fun in such a short time, and managed to get it to a playable state within a couple days, something that hadn't happened before. I feel like the jam opened my eyes and finally let me see the value in ACTUAL small games — I even got another small game idea right after finishing POND PONG, and I think it's achievable!
Anyways, thank you for the sweet comment and I'm glad you had fun!