Since according to the rules it is not forbidden to develop in a team within one day, does anyone want to join on the first day?

I wouldn’t mind. I’m rather new to game development been working with godot for a bit so I know some tricks in that engine, along with a bit of unreal engine, though I could pick up a bit of unity though not familiar with the language of it. 

I would love to join. I am rather new and love to make games but honestly I dont know much.

does anyone do art?

Just a word of advice if you agree to work with other coders but have little to no expreince working collaboratively I would urge caution, its just as likely that new team mates lose motivation or are no shows and you may spend your time chasing other people for promised work or unpicking their code from yours.

The best would be to code alone and grab an artist or two and someone to supply music and FX, your not going to have time to portion out coding work on a jam this small.

If your super new try using AI for help or debugging.

I've struggled with these issues on much longer jams with more time for the team mates to bond and learn how to work.

I'll be doing this one solo due to the time constaints and I have a few people I can go to for assets if I need them.

I can agree with that. Especially with the time constraints.