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Most likely of some nature, yes! Can't say if there will specifically be stomachaches, but most definitely more endo content.

Ah! If you mean the picture of the girl with the pink/purple hair and eyes, you can start that interaction in the first room you enter after jumping down into the dirt tunnels. 

Near the end of that room, the path splits - right leading to two waterfalls that you hop over, and left leading to that interaction. You'll know you're in the correct place if you see the giant ring:

I believe so! I've only used it a little bit, but there's a tool out there called "Translator++" that can translate RPGMaker games into other languages.

Here's a link to its page on the RPGMaker forums.

Make sure you rotate all 5 of the blue crystals scattered throughout the area. A bit of dialogue plays once you've got them all to inform you. :)

I might add in a dedicated quest log plugin in the future when/if the game opens up a bit more, but for now quests are assigned from the dialogue windows only. What part are you stuck at?

Right on, my guy! Thanks for playing! :)

This is a common error a good number of people have encountered when using save files from 0.0. I can't say exactly why it occurs (I think it's because of plugins that were added post-0.0's release), but using a clean save is known to fix it. 

There's a 0.1 save file in the ZIP folder that you can use to skip ahead to the first shrunken segment - instructions on how to install the save file correctly are included as well!