Can some one tell me is that is specific game engine (Anitya) i use unity

Hi there! Yes it is another app to build immersive experiences, 3d worlds, etc. It is web-based, and low-code, so it is seems easier to use than Unity :) It is this one  https://www.anitya.space/

You can also join the team and the community on Discord if you have questions or are curious about it!