If you need to make a 2D game you could use a free plugin called PaperZD but that's about it.
And yeah modifying the camera will not make any difference, it exists only to provide a widget to see on screen.
The scene capture component is your man !
Viewing post in Smooth Pixel Perfect Camera comments
Oh no, I'm trying to build a 3D pixel art game. One more thing I noticed: the shadows are a bit "odd". The player character for example is lacking a shadow. Is that related to the scene capture? Or is the project setup? (I haven't tried this solution in my own project yet and I'm using the sample project you provided to experiment)