Hi!
On our game jam page, a section titled "How to submit?" explains how you can submit your game. Were you able to complete all seven steps? If not, could you tell me which step you are having trouble with?
Also, yes, you can submit multiple games. However, each participant will be eligible for only a single prize. We wrote about this in the item #8 of the "Rules" section.
Thank you so much for participating in the jam. Again, if you keep experiencing issues, please provide us with a bit more detail, and we will try to resolve them promptly. You can send us an email at support@playspinoff.com as well.
Thank you!