It was the first enemy encounter before the two doors you get to choose to go through. I got there pretty quick with the Super Speed. Not sure if it was just that fight so I will test it on another fight and report back.
Not sure where the saves are located for the Windows Store version of the game, if you know please let me know and I'll gladly supply a save.
Edit: Second enemy encounter and they are in fact invincible it seems with the Infinite Health activated.
Edit2: Third enemy encounter & same results.
[Edited by Rhark, 6/29/2019 10:56:12 AM]
You're very welcome Thanks for listening to my feedback.
New version works perfectly.
[Edited by Rhark, 6/29/2019 3:12:12 PM]