I've bought and played through the whole game (with the exception of getting all the crystal shards part.)
First, thank you for making this game, it was overall enjoyable! There were some bugs along the way and the missing art certainly soured the experience a bit. But still overall enjoyed it.
Second, it was nice to see the whole party being able to grow, thinking that it would just be Alice, great touch!
Third, might just be an RPGMaker limitation but the equip and unequip skills when Alice changes classes several times in the game was pretty annoying I won't lie.
There were definitely some challenging boss fights, which was nice to see.
In terms of bugs, two bugs one is major, the other minor. They're related to each other. The side quest when you go into the volcano with the siren, the bug is probably due to the fact that you can open the door to the volcano without Alice in the party (basically avoid dropping down the rope and head straight to the door instead.) So what happens is once inside the volcano you're an invisible sprite that can walk around and engage in fights but you auto-win since there is no party. Was able to defeat the Demon King without fighting because of that.
The minor bug, after dealing with the demon king and coming out of the volcano, once you drop the rope for the rest of the party to actually join you, Alice is not in slot 1 of the party so her sprite doesn't show up, she's in slot 3, and you can't change that since she's a key party member.
While seeing the rest of the game in an unfinished state is a bummer (Side Chapter being incomplete for example), it's still pretty good overall :)
It was a nice short RPG game to play, I do hope you'll do more FMG/GTS related games in the future!