I also just beat the game. But I took my time and thoroughly relished the experience! Mock me if you like, but I've done nothing but play the game the last few days and my game save has over 40 hours put into it.
Did I really just beat the game though? The ending said, "the end?". And the ending gave me the number to the 4 number locked door. I also haven't so much as visited Scotsholm yet. As well, my characters are only level 23. Most games have a level cap at 100, there are very few exceptions to the level 99 or level 100 level cap, one of them being Super Mario RPG. There's also the fact that I didn't even truly defeat the final boss, and the Dark Witch apparently has a demon overlord or something, as well as being saved by someone(a vast conspiracy of sorts seems to be afoot). Not to mention the fact I only just finally activated my elemental stone. Those are evidence to the idea I've only achieved the "first" ending, and there's a huge rest of the game following me, only being 1/4 of the way through the real game.
And yet, I am at the hero's mark limit. I can't level any further. As my stats say, I am at 20/20. Also, if you get the "true" first ending, and continue the game by going though the password protected door, I'm truly stumped for the first time in the whole game. And believe me, I spent a lot of time figuring out some earlier puzzles. But no matter how much I try to explore the door, it seems like a dead end. I haven't found anything there except loads of treasure chests.
If there really is a rest of the game, I sure haven't found it yet. I'm hoping there is a sequel, and soon enough. And it gets translated. I only just got settled into this universe. I need more.