I had removed the SHIFT key which was causing this crash-bug, and it's happening again? I'm kinda confused, are you playing the new version? I tried it here and worked fine, btw the choice bug happens so, I'll fix it for the next version. Thank you for the report, I'm testing the game just now, the major thing is running well. Now I'm thinking about the possibility to make the game focused on Guild Battle/Missions with a lot of images and H, of course, will come with choices and corruption as it already is. Since I am still new to the community, I'll let your guys decide, a poll was opened and you guys can vote. But Ren'py, it's out of the question, I do not like Ren'py at all, Legit haven't mentioned it but I will, I hate Ren'py and to do it with Rpgmaker makes me pleasured! :V Now, go there and vote. You have the power!
~Dev Gilgamesh
Just downloaded, so I suppose? And it's not the shift-key, pressed X* which opened up the menu. From there, if I press it again, it either opens menu again, gives me an error, or, if I repeatedly press it, may actually close and progress the game.
* Aka the "B" button, which should be the cancel/menu key for RPGmaker, and auto key-bind to X and Esc, along with right click for MV IIRC, plus it can be changed by pressing F1 or something.
And: though you can stop menu from opening, it seems part of the game? So might be a better idea to lock the menu till certain points, like right before a choice, to allow players to save, if you're going to continue along this path.
Huh, didn't see that poll -- FYI, voted for the corruption bit, because I don't think VN style works for this system. Well, it works, but either seems like a hassle to play, or not that enjoyable, in it's current state.
And I can understand why you don't like renpy, I saw another dev that didn't (Siren Domain), along with your comment earlier, so it's understandable from a developer POV, but problem is the consumer's perspective also matters.
Ps. I tried the game (tyrant quest) you linked, and it seems to be using a different system than what you're currently using, so I think that point is kinda moot. Sure it's from the same company that made/published RPGmaker, but it's a different system. Though, if you do use that one, then VN should be better than now.
Edit: What Darth is experiencing:
I got an error as well when I hit shift to save, but after I crashed the game, it loaded my save game just fine, and I haven't gotten the error again. I was trying to get it so I could shoot you a screenshot, ah well, as long as the game works!
Edit: Seems to be happening on a new game, first save. TypeError, cannot read property '0' of undefined, but it doesn't happen all the time.... Hmmmmm.
Right clicking with the mouse button on the save screen seems to trigger it too.
It happens occasionally, and seems more likely around choices.