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Yes, that sounds right.
While I can't speak for Axel's route at present, I'm currently working on getting Ellis's ending fully playable, and I'm hoping to have that ready for the next build.
Thank you once again for taking the time to comment!

I can't view the recording, unfortunately. 
Would I be right in thinking the soft-lock occurs just after the choosing a letter section?

Hey friendhelping0, thanks for playing the game and for your comment! Work's being done to hopefully squash the bugs for future builds.

If possible, are you able to share a screenshot of where Ellis's route becomes bugged, or the last line of dialogue before the soft-lock triggers?

Is it possible to romance Gisette and still get the best ending for Revaire?

The files that got flagged for me were Unity.2D.PixelPerfect.dll, Unity.2D.SpriteShape.Runtime,dll, Unity.2D.Common.Runtime.dll, Unity.InternalAPIEngineBridge.001.dll, Unity.Mathematics.dll, Unity.2D.Animation.Triangle.Runtime.dll, Unity.Timeline.dll, UnityEngine.UI.dll, Unity.2D.Animation.Runtime.dll, and Assembly-CSharp.dll.

It might've been a case of correlation ≠ causation and I experienced the bug in addition to Norton being too eager, but I hope this helps, if only a little.

If it helps, I had this too, but I think the issue for me was that my anti-virus decided to be overzealous and remove a good chunk of files from the game folder? I started another playthrough after returning the files and I got to the intended ending of the demo.