Hello, thank you for the interest! It’s actually made using an engine called ika. It’s definitely similar in vintage to RPGMaker 2000, but a lot more customizable with Python scripting. :) And yeah, the cliff tileset is definitely FF6 inspired.
You won’t have to wait long, the full version will be out in about a month, and you won’t have to pay for it either.
Hope you download it then!