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I'm not sure which you might be referring to, do you mean the ending linked with screenshots on the page or by how they're listed in game? I'll assume game and drop more detail on that order. 

END 1 (ANNA) - Can be achieved by succeeding on all of the puzzles and agreeing with Anna. 
END 2 (BEL) - Can be achieved by having a mix of both success/failure of the puzzles, you could get all of the puzzles correct but if you are dismissive to Anna you can get this ending or vice versa. 
END 3 (RICHARD) - Can be achieved by failing all the puzzles and being dismissive towards Anna

There's 3 endings. Maybe, I can't say since I know the answers but with saves and remembering the answers from before will give you more time to work with it. 
Hints on the endings:

• failed all and be mean with replies
• succeed all and be nice with replies
• mixture of failure and success

Ok ok, that's not a bug, Bel warns you that there's a certain angle that is correct. Even if the image is "correct" it has to be in the right angle. Just a hint, head on the upper left and butt on the upper right. Also on the second puzzle there are already correct pieces meaning you don't have to touch some of them. 

Care to explain what happened in the bug? I haven't encountered the issue with it so more information would be appreciated.

Thanks for your comment.

I want it to be difficult to encourage multiple sessions and quick thinking/analysis, so this is a design aspect I will decide to stand on.

Can you elaborate more on the bug? I've play tested it multiple times and the timer never just ends and that bug carries over to another puzzle. I just tried it now on my computer and a low-end laptop and completed the game with no bugs whatsoever. But you are the second to mention this so I'd like to nip it if possible but I have no clue what the issue might be. Since the event sequencing is all correct. So I have a few questions about it.
Were you on MAC? 
Did anything else happen when the timer hit 0?
If you tried to start over from the beginning, did the bug persist?

I don't have a Mac but there shouldn't be any permission issues, are the other games RPG maker games as well? 

I'm sorry I can't help you much, I'd try asking the community forums. 

There will be more for this, I'd like to make it a series. 

If you haven't found it out yet, try getting everything wrong and not placating Anna.

...RUN! (BTW there's no traps in this game just in case people think there is.)

I can guess the ending you got, were you able to get one of the other 2 endings?

I'm submitting mine hopefully tonight or tomorrow!