Cool concept! I played it and tested out the movement and swapping colors. Could you share a little more about what the planned level was supposed to be like?
I saw the other comment about losing the Unity project, I probably don't have enough experience to advise (this is my first jam) but we used Unity Collaborate which worked really nice for us: https://unity3d.com/unity/features/collaborate
I imagine it's still possible to have conflicting changes that could cause you to lose some work, but it's really easy to roll back changes etc... I was hesitant about using it in the beginning but I think it probably saved us a few times.