@Benni003 remind me the current issues you face, please?

Kartoffel told us both that AA and shaders will have no effect.
This is to be a 2d game correct? So then you should need lots of 2d assets. When you scale down the current quad you have 2 issues
1) an untextered black boarder
2) a jagged ugly texture quality.

My solution would be how they would do it in a real game.
1) never scale the quad, clear it, then repaint it with a different texture
2) if you have to zoom in %50, open you digital paint program and modify the %100 texture there. You can use the scaling filters of a 2d art program to create a second texture, or you can actual paint the second texture.
3) You will not be able to quad a giant area one, then move around it and zoom in and out. Not like loading a 3d world. Your world should be constructed of many textures that relate to a grid set-up. You will need to paint and repaint the textured quad(s) to move around on the world and zoom in and out.


You may question this advice, however there is a reason that Zelda and other games work how they do.

Thanks for the fun
Mal