Interesting idea and well executed imo! I think it's pretty cool that you made this with JS as well :) If I had to give criticism I'd say I found it a bit awkward using arrow keys rather than WASD.
I get the awkwardness with using arrow keys. If I had taken a bit more time, I probably could have found a plugin for WASD, but RPG Maker's only built in movement controls use arrows, so I rolled with what I had. Thank you for the kind words.