I planned this game to be target of mobile devices, but I had some problems to release an Android apk.

It was not a problem with Godot Engine, but unfortunately it took me a long time to figure out the problem.

I think that there is an issue with the jarsigner when it tries to sign a file with non-latin characters in the file name. In this case, the file was the 5x5.ttf font ("x" was the multiplication character "×").

Anyway, fortunately now I was able to release an apk and it worked as expected, even the viewport preserved the aspect ratio of the pixelart.