How Complex can a 3D Mobile Game be?

I’m new to Games Design and I want to create a 3D Horror Game for PC and Mobile using stylised assets, however, I understand that the game has to have a low polycount so that it can increase performance and function without crashing. What would be the maximum polycount and would 3D stylised assets be too high poly for a Mobile game?

There’s many other things that affect performance so there isn’t any specific guidelines to polygon counts, usually you go as low as you’re comfortable with.