Quite frankly, I think it'd be easier to open the game on RPG maker and check the events for yourself if you want complete exploration of the game. There are even some maps in the game files which (still?) haven't been implemented, so in the end a no-clip would only allow you to see what you're supposed to see, anyway
This is true.
For some reason I had the idea that .flow was un-openable in the RPGMaker editor.
Eh, oh well.
Yeah, you can open it in RPG Maker 2000.
It's easy to make a noclip from there, just remove the restrictions on tileblocks to allow movement on everything.
To noclip in RPG Maker, just go to playtest the game (press the green 'play' button near the top) and hold down ctrl while walking :3
This allows you to walk on any tile, no matter what the terrain tag or what have you~