Yes the main story is done. I also remember they metioned goin to add an epilogue to the game later, tho.
would u say I should read this before Smoke rooms?
Yeah, its a standalone story to TSR anyway so it won't effect your experience, assuming that u've finished Echo.
Yes I have only just finished Echo, so I will start this one now! Originally I was ganna read TSR but ill wait after Arche now!