Lifeboat "Prison" game deleted progress

help. me and my friend were playing for very long, we were on level V. had alot of good things diamonds and stuff, and then today we enter and all our progress was gone!1 i was on level H and he was on A 🥲 im very sad bcus we were playing for very long. i am very thankful if someone can help. i played for very long and then this happen…