Thank you for the in depth feedback!
I was worried people would not agree with my interpretation of the theme, but I am glad you liked it.
And yeah, the R button should probably only reset you if you die, just like Hotline Miami.
Also the green shirt guys do disappear if you don't have a line of sight with them, in fact all enemies do, this is a mechanic that is not very clear because I could not put a tutorial in the game.
And indeed that is a bug, I was aware of it but could not fix it in time, at least the R button becomes useful when that happens haha.
And again, thanks so much for the comment, I really appreciate it!