My game is a simple 2D Android game.
What you suggest to me to use? GLES3 or GLES2 ?
Also, if i will use the GLES2 i have to enabled the Import Etc to ON and the Import Etc2 to OFF?
GLES2 is a better bet for simple 2D mobile games, because it's more widely supported. ETC2 is indeed not supported with this renderer, you have to use ETC.
Thank you very much.