The game is built on RPG Maker VX Ace. The .rar format for updates during this period suggests a manual patching process often used for non-Steam versions or DRM-free builds.
Adjusting the difficulty of late-game bosses and encounter rates. Development Review Last.Dream.Update.01.03.2018.rar
Improved compatibility with modern Windows OS versions. The game is built on RPG Maker VX Ace