Max defined character level is only 71, and you do reach the currently allowed max size of 4000 then. But since the monsters don't change after you beat the final big thing in the bottom of the cave (trying to avoid a spoiler), indeed good luck with the grinding to get up that high.
I personally have fixed up the coding and text a lot in my own copy, and even extended the demo to include some content that was scripted by TFarrgon but not included for play in v1.06
But I'm not planning on releasing it unless either TFarrgon says its OK, or this page here can be declared abandoned - in which case I could take it over, but Preggopixels has more rep. TFarrgon is doing _something_, because my Discord activity says they've had RPG Maker MV open for 10 hours today. But they haven't responded to my direct messages months ago listing bugs, or asking them about releasing my changes.