Details about challenge:
https://blogs.sap.com/2023/05/10/sap-developer-code-challenge-open-source-abap/
Simple Hello World class pushed to GitHub: ZCL_HELLO_WORLD.CLAS.ABAP
ABAP2UI5 simple demo implementation: ZCL_TB_DEV_CHALLENGE_WEEK2_NEW.CLAS.ABAP
ABAP Mustache simple demo implementaion: ZCL_TB_DEV_CHALLENGE_WEEK3.CLAS.ABAP
Complete demo game made with Axage (ABAP teXt Adventure Game Engine).
Game engine used together with ABAP2UI5 => example repo here.