After your game I am confused and frustrated :)
Grey people everywhere!
Damn grey people constantly are sending me back to a bright place with a tiny piano telling me the wrong names of notes and reviving me if I play along.
I decided to not shoot anyone and I ended up with a huge fanbase, following me and inevitably sending me back to the piano again.
But I wanted to believe in myself, so I hammered 'x' so damn hard. But to no avail.
In the end I really feel, what the game tells me to feel: No satisfaction. :(
So you succeeded. And I did not find the ending.
You nailed the first idea: (THE WORLD IS AWFUL AND THERE ARE NO QUESTS TO TELL YOU WHAT TO DO)
You could argue that also for the second even though for me it does nothing (PRESS X RAPIDLY TO BELIEVE IN YOURSELF)
I could not find any hint of the third idea (YOU HAVE TO SING KNOCKIN' ON HEAVEN'S DOOR TO RELOAD)
For the last idea, there is not enough ammunition and too many grey people to murder everyone... But this is on purpose, right?
The grey people need to make noises to make it more intense. ;)
Oh and don't use the default standard assets. hmmm, but maybe it was also on purpose, because of the "aweful world"?
My entry: https://peldon.itch.io/emibyhms