I saw that upbge/bge have a menu to choose the type of physics, bullet or no physics engine at all.
So my question is: could i implement physics engine like Godot physics?
If it possible, then how can i do that?
short answer: no
long answer: definitely not by any conventional means.
unfortunately, based on your answer, it turns out that, apart from bullet physics, no physics engine is available for bge/upbge