Hey! I don't really have a whole lot to add since I think Tim covered it pretty well there :3
Personally, I'm a lurker type because of my anxiety, haha, so I don't really join in all that much with the community, but there's definitely a big community there if you're more sociable and active with that sort of thing! From what I've seen on Discord, the community is pretty friendly and supportive.
As Tim said, when it comes to actually working on your jam project, you probably won't have all that much communication outside of your jam team, but the Discord community is still there to discuss progress and ask for feedback on stuff if you want it :3 I've never seen anyone being nasty or anything like that. I'm sure it must happen occasionally as it tends to in every community, but for the most part, it seems like a lovely place!
When it comes to jams, I tend to shut out most things and focus on the project, but once the jam is over, I always try my best to play all the other games that are submitted and leave some form of comment/feedback for the devs :3 It's just a really nice way to finish the jam and see what everyone else has come up with.
These jams are a lot of fun! I'd say definitely give em a go if you feel like it :3 Just try not to get addicted to them like I have xD
@Tim I'm so sorry, I totally forgot to come back and comment once I finished going through the demo >.< I don't want to spoil anything, but I adored the bit at the very end, haha. It made me laugh and I thought it was very cute :3 I love stuff like that when you're not expecting it.