I got this game for round 2 of judging. First, congrats on getting to round 2! Here are my thoughts on it.
The idea of the game and game world is neat. Magical girls who fight off invading aliens and save the population. I feel the story is presented well too.
However I do feel your battle balance needs an overhaul. I lost the first fight due to a bad miss. I lost the second fight on my first two attempts due to my ultimate ice spell missing both times. Skills that cost me MP should never miss unless I'm inflicted with an ailment or the monster has a buff, neither of which applied here. Also why are there no HP or MP restore items except the one I get to start the game? I was constantly running around with 1 or 2 girls at 1 HP and 0 MP and hoping the rest of the team could carry me forward to the full restore point so I could finally heal.
As it is I ran out of time as I got one hour to judge it, and the hour was up before I could see this through to the end. I probably would have finished if I hadn't died so often and had to retry battles and hope for good RNG for my attacks to actually land though. I do hope you really consider making it so that skills that cost MP never miss if you are going to have HP/MP restore items so rare, as otherwise bad RNG can put you in a spiral of doom, especially before the first chance to save as there is no way to go back and try to do better in those first three fights.
One other suggestion I do have: The healing regen spell is a nice idea but it doesn't continue after battle so it feels almost useless as I often get it up too late to matter. Maybe either let it carry over after the battle, or make it a straight up healing spell with some regen?
Overall I feel you have a solid idea for the story, but do need to overhaul the battles especially early game. Remember the player is still figuring out the game. But I do hope you expand on this and fix it up as it could be a really solid game in the end.