I'm pretty sure getting ideas from other people is allowed. People have been sharing ideas and such in the discord and acerola has yet to take them out lol. Playtesting is also allowed, which is pretty much getting ideas and suggestions from people partway through game development, so I don't see why getting the same at the start of the process would be any different.
For sounds, as long as you can legally 'redistribute' them via github, they are not made by AI, and they are not made by other people for this game project, then you should be good from how I understand it.