Firstly, huge congrats! Finishing your first jam is hellishly exciting. And well done for sticking through the challenges and making it to the end. This is my 2nd jam, and it's an amazing feeling to get to the end. Or at least, it feels amazing underneath all the exhaustion :p
I totally feel you about scope. My job involves accurate scope estimation for projects three to four orders of magnitude bigger than these jams, and I still over estimate what I can do here. And I also wouldn't have it any other way. For me, these are about ambition and having fun and just throwing caution to the wind and seeing what comes out. Still, my challenges are much the same. Hitting day 4 and seeing the writing on the wall when it comes to scope. Knowing some of those cool & flashy ideas that you had a few days ago aren't going to make it. Hitting day 5 and an unexpected bug taking a few precious hours out of the schedule. Hard coding some super flaky code just to get that object spawning in where you need it, despite many many years of training saying how horrible this code is.
Regardless, let me second your congratulations to everyone. Whether you succeeded or not, I have a huge amount of respect for everyone who tried new things, learnt new things, experimented with something that excited them and just went for it. It's awesome to see. And if you're new to game making, or coding or whatever, and you don't feel what you've done stacks up to others, know we all have a huge amount of respect for you've done regardless of where you're at.