Build a DApp on Nebulas (blockchain)

Need build a DApp on Nebulas (blockchain).

what is it? read here:
https://incentive.nebulas.io/signup.html?invite=41sbH
https://medium.com/nebulasio/nebulas-incentive-program-demo-11584736178e
https://medium.com/nebulasio/how-to-build-a-dapp-on-nebulas-part-1-da4eaf9399bc
https://medium.com/nebulasio/how-to-build-a-dapp-on-nebulas-part-2-5424789f7417

Obligatory requirements
1) The application can work normally on the Nebulas network
2) The application has a basic interface;
3) The application has the fundamental requirements of rationality;
4) Does not violate copyrights

*The application can be downloaded directly from the Nebulas website and get 100 NAS (~1000$)