Upgrade doesnt work in iPhone 5S

I really liked the game but wanted to play with more than just one friend so I upgraded and paid.
Problem, it doesnt work anymore! Impossible to open the app now. I tried everything from reinstalling the app, rebooting my 5S, etc.
Nothing worked. So dont do it!
And if anyone could help me I would really appreciate.

Nwaw about Tall Chess, v1.0.5