Back in LD25 you could join in lately and I don’t think much have changed since back then. To submit you only need an account on the site.

I’d recommend writing a short “I’m in” post to describe the tools of choice.

You only have to submit your game during the submission window. There’s a custom of making an “I’m in” post. Many people say things like what language and tools they’ll be using in this post – but this is not strictly required. Good luck!

It is required if you plan to do the 48h compo and use your own basecode. It should be declared (and made available to all participants who might be interested!).