Thank you very much! I'm very happy to hear that you liked the game!
Yeah, it was a limitation of the engine that you have to re-equip skills every time you change classes, which I can imagine gets annoying. My next game will most likely not use RPG Maker due to just how many engine limitations there are.
Thank you for the bug reports as well! I'll look into fixing those issues as soon as I am able to!
Regarding the side chapter, it's technically complete, however, there were multiple stuff cut out from it since the scope of the chapter got a bit out of hand.
I do have some plans for more FMG/GTS games in the future, however, what they will be and when they will come, I have no clear date yet.
Thank you for the kind words!