How can I make the characters has a much bigger resolution ?

[MisterHex]

I would like to know how I can achieve to have an resolution like the one in changed:
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[Andar]

resolution = number of pixel per inch (or similiar measurements)

You need to increase both screen size of your game and the size of all graphical resources to do that.

Increasing the screen size without increasing the asset size will make everything smaller on fullscreen.

remember that screen size = minimum map size, so if you make your projects screen size larger then you also need to make larger maps to prevent display errors.