Game is made by rpg maker ace.
game.rvproj2 can be found by purchase rpg maker ace.
and yes. its in dev bak. because its a backup for myself, not end user.
RTM release(like ver on itch) is faced to market. will delete anything unused to decrease file size.
Modding guide is trash shitpost made myself. cant help with my broken english , i already did my best :-/