A bit of both for me (my first jam also). I have pushed myself more than I usually would and so the development has definitely been faster than for my previous games so it has been satisfying to see the game together quite quickly but I've also found the deadline to be stressful. I'm kind of obsessing and not taking time out to do real life stuff like exercise and eat properly which is definitely not good!
I've already submitted something so I know I can just leave it there and it will be good enough. I can slow down down and just work on the game at my own pace and yet I can still feel that "pull" of wanting to get my final vision of the game into the jam before the deadline. I think this jam has confirmed my knowledge that I just don't do well with deadlines in general lol!