I am curious to see games developed without a game engine, like mine. Is it possible to filter them?
No.
It's the thing how absence of evidence is not evidence of absense. You do not need to tag engines or identify them in meta info, and there is no autodetection.
There a few tags developers might have used, to brag about not using an engine. I think c and cpp are such tags. But strictly, a lot of pure html5 games might fall in this engine-less category. Unless you consider html5 to be the engine.