Very short demo.
I like the art style, but there are two issues I need to point out: first, the dev only customized the art of the MC and the goblins, and their style doesn't fit the generic RPGM assets at all. Second, the combat animations take way too long. If there's going to be a window showing the move, no need to show that 'charging' effect before.
As for combat, I must agree with
massivelizardcock here: goblins usually aren't the kind of monster that can take two lightning bolts and keep standing. This is counterintuitive to how combat works in medieval fantasy settings. Also, if the lowest monster take so many resources to beat, combat will quickly feel like a chore, because it will drag. I think a larger number of enemies and less MP might make losing to goblins more acceptable, specially if you introduce something to restore MP after the first groups of goblins.
Of course, it all depends on what you want to portray in your game. However, I might add that, if the magic in your game is so unimpressive it can't kill goblins, why even have magic?