Thank you very much! I'm so happy you enjoyed this game. It was a real challenge getting the landing working at all within the time limit. I'm currently working on a better system that should solve most if not all of the issues that currently exist.
I think the bug you have is probably a result of the collider being too spherical, so it is having trouble detecting that it is grounded. I think I can fix it by making the collider more complex so I will try that for the next build. Thanks for the bug report!