Great chapter, I'm curious what those last spreads were about but otherwise the author did a good job dealing with the obvious issues time travel introduces, so I'm happy to wait and see what they do.
Wished the mangaka focused on the medieval warfare a bit more and keep the future stuff for the second half
Pretty sure we are in the second half, most of the worldbuilding has been set up, the main antagonists has been introduced and the main character has come to term with his situation, learned the truth of the conflict he is a part of, and found a new/renewed reason to fight the real battle.
To me that chapter screams end of the first half, I wouldn't be surprised if we got a time skip soon.
Also, I doubt we will suddenly stop seeing medieval battles, both side seems intent on not fucking the timeline too much so I don't think we will see modern or futuristic weaponry before one side gets really desperate.