This is extremely impressive!
However, There's some jank where if you double tap the arrow keys too quickly the next press will cause a dash even after a significant waiting period.
The platforming could benefit from being able to hold down to fall through platforms instead of having to press it each time, and having a variable jump height mechanic (tapping jump results in a smaller jump than holding it) but, knowing the limitations of RPGMaker, I understand these may not be easy or even possible to implement, as its already a feat that this game controls as smoothly as it does.
I really enjoyed it though, and I'm very much looking forward to seeing further progress!