when I tried to load your project from your server I got a Forbidden error - it would not let me see anything (trying to access from Canada)
I downloaded your file and exported it and put it on my server - you can try it here to see if there is any difference: (it was exported before I added "trigger once")
https://www.rieperts.com/meta
after running, I noticed it was generating thousands of errors and warnings. it was constantly trying to exit fullscreen mode.
on your botones_barra_superior event sheet you have events 4 to 9 running every tick. If pantalla_completa is 0 then it tries to leave fullscreen every tick and that causes an error if it isn't in fullscreen mode.
you should add a "trigger once while true" to each of those events, or structure it some other way so that the events only run when needed.
my iPhone 5s couldn't play the gregor game until I added the trigger once conditions. (it would give an error and restart the project from the beginning)
the video is pretty large (34 MB) and the images in the game could be a lot smaller, and you may want to try making them sprites instead of tiled backgrounds.