Thank you for your attention!
Yes, these are screenshots from my projects for Defold.
In fact, we forget that mobile devices have come a long way of evolution and have now become quite powerful.
I tested 17M polygons on a 2019 mobile phone and it was even playable (about 15 FPS).
I think we are ready to break the limits! 
UPD:
It is important to bear in mind that the main limiting factor is still the fillrate. And here the problem is no longer the number of polygons, but the volume of textures and the presence of complex render passes with float render targets. Yes, all the same problems that conventional 3D engines had 10 years ago.
Plus (or rather minus) Defold still doesn’t have MRT. :(((