Awesome game! Took a while to beat the game without resetting HP/MP between battles. The third battle was the hardest for me, you definitely have to top your party's HP and MP going in.
The party's skillset is great. The Refresh skill is brilliant, definitely makes the combat fast-paced but still tactical. The healing spells restoring max HP feels impactful but not at all overpowered. The single target nukes offer distinct roles between burst and sustain damage. And Disruptor's skillset provides a clear distinction between physical and magical damage: magical attacks' damage can't be reduced like with physical attacks, but you can reduce the frequency of it occurring by draining MP.
The battles are memorable, and makes you fully utilize all those skills to the fullest. Definitely feels like solved puzzle after a while though, but it doesn't matter because this is intended to be a very short game anyway!