There was a human kingdom. This kingdom was a prosperous one. When the kingdom fell, unsavory individuals rose to power.
That's not your main problem. At the very least, you might face them while trying to escape the Jail, and by extension, this Kingdom. Your current concern is escaping.
Standard RPGMaker gameplay. Control only one character with minimal friendly NPC interactions.
Die & die repeatedly to increase your stats with an item you gain from dying. Or grind your levels the hard way.
Discover an ending. Do it all over again. Change the order of events and discover the end of your journey.