It's a tile.
The game is similar to Castlevania.
With version 2.2.0 it would jump to a tile that was above the player on the map.
With version 2.2.1 it no longer does. He jumps up and doesn't stay up, he goes back to the ground.
There is a little problem with version 2.2.1:
Version 2.2.0: When you get under a higher platform and jump by pressing the up arrow, the player stayed on the platform.
Version 2.2.1: It is no longer possible to jump to a higher platform in any way.
I've been working on something on and off for a few years now, and I've been reluctant to share any details on the project before I had anything playable because I did not want to generate hype only for the project to go back on hiatus. That being said I believe what I'm working on is very unique and pushes the boundaries of what RPG Maker projects can be. Bold claims, I know but just wait.