I admit, I'm not a huge fan of RPGmaker style games. But that might be because I mostly play them in jams, so they're usually more rushed. But I actually appreciate this one as an exercise in trying a new perspective for you as a developer.
And while I'm not familiar with the inner workings of RPG maker this setup did set my mind off with future possibilities. Like having a sort of Oregon Trail meets Metro Exodus style game where your party is travelling by train across some large country, having to gather supplies, stop in towns, and of course fight off Kaiju.
What would be extra neat is if in these train encounters there was some way to add a condition where every so often a tunnel or other low hanging obstacle would brush the top of the train. And that could either damage everyone on top of the train, or give the player a set amount of time they simply need to survive. For example the player only needing to last 4-5 rounds against a Kaiju before entering a tunnel too small for it to follow.
But I digress, as this game is I think you created a cool sideview battle. And while the battle would be a bit much if it were in the middle of a fuller game, it works for this as its just a test level really.
Also to be honest I wish I was able to control my game dev ambitions well enough to JUST focus on a single battle like this lol.
Good work!