A question

Can someone give me details on how Jace works?

Which jace?

on the rough surface, when you want to use the Trinity bullets, you need to move in Forward/Left/Right while sub-clicking the Trinity bullets. Available in three kinds, and with limited usage, as well as the paths

I got the one on limited not sure about which variant is that.

It's whatever varient you want it to be when you reach level 1.

What kind of bullets does trinity bullet have? Currently trying out the melee path, so that I can finish up my nightmare first.

I believe Jace has shock, freeze and barrier bullets.

use the search function, youtube and see which one you like after testing him yourself