I speak some languages, so just let me know wich language are you comfortable in if you want?
"About the fight yeah, I already send the file to my friends for the prototype test" No! I wanted to say the fights are very well made! Die Kämpfe sind gut gemacht! Бои сделаны хорошо! I combattimenti sono ben fatti! Les combats sont bien faits!
About the plugins, the first one (NameInputUpgrade) works with MZ. I actually don't know about the second one...
About the tile, I get where you are standing but it's more about continuety then about secrets. Rather have a puzzle to solve than gettting lucky but that's your choice.
The NPC dialogue situation (sorry that it is in english but i don't know wich language you're speaking:
Also for tutorials i can highly recommend the youtube channel "SumRndmDde" but his tutorials are in MV so you gotta know yourself...
Keep improving!