Over 700 years. A tower originally built in 1310. The island it’s on is an exclave that is technically part of Hamburg.

No offense but for me as a developer this post raises a couple of red flags. If you want to get me on board and excited about this you will have to announce some more details. In particular: what sort of technology stack are you using? Right now all I can see are mockups and the vague idea of releasing to iOS and Android at some point.

Again, not trying to attack you or your project but I feel like with the technical audience on this platform some more concrete information is warranted. I hope this turns into an amazing client someday soon :)