It was originally released in 2020 with an MZ engine. I switched to it from MV before the v0.1 version has been released.Well. Switched a few times, it seems, since it was originally RPGMV and then MZ. See quote below.
Using Unreal for a (very small content-wise) game ... well. You need to optimize it then because there isn't gigabytes of content in this. Unreal is not very economical with space.
Also, Unreal is very economical with space and resource consumption if you know what you're doing. It's one of the reasons I switched to it. Back in 2020, I ran several tests comparing MZ and Unreal Engine versions with the same content amount. Unreal won every time in terms of HDD, RAM, and CPU consumption. No need to mention it was already a version redone in 3D. For comparison, the RPGMZ version with the current amount of content and animations would consume around 3.5 Gb of disk space. The current UE version consumes less than 1 Gb of HDD space.
The initial choice of RPGMZ was a huge mistake, as I've already had good practical experience with Unity and Unreal back then. RPGMZ looked misleadingly lightweight and cute before I got some real experience with it. Plugins and extensions didn't help much.
In my opinion, RPGMZ is okay-ish if you want to make a game that can be run on a potato PC or if you're a beginner developer with no coding experience. It's very limited, though, in terms of data structures, data management, and graphics rendering. If you want to have freedom of implementation for your game mechanics, then it's better to look at one of the general-purpose engines, like Unity, Godot, or Unreal.
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