Basically, 3dSen is an emulator that converts the graphics from any NES game into real-time 3D voxels (polygonal pixels).

https://store.steampowered.com/app/1147940/3dSen_PC/

Has anyone from here tried this emulator? The videos and screenshots shown on its Steam page are from homebrew games - however, the 3dSen emulator can dynamically run any NES game regardless of its age or official status from any region this way. It seems fairly cool! And yes, it supports save states.