Quote: "1 it is possible to make a different screen loading image between each level?
i mean when level1 is finished then we have a loading screen n1, when level2 is finished we have a loading screen n2 etc"
How to Change Loading Screen Image
https://www.youtube.com/watch?v=VLA8r4QFZCo
A tool to Help Change Loading Screen Image (Style Guru)
http://asanguis.wixsite.com/styleguru
Different Loading Screens via LUA Scripting
https://forum.game-guru.com/thread/216831
Quote: "2 why the actual PP version of game-guru is faster than the compiled standalone ?"
You mean why is the editor test mode in the PP faster than the compiled standalone with the PP version?
Quote: "3 at this stage of game-guru it is possible to make a real multilevel solo game?
i mean a game with 20 levels for ex"
Depending on if you lightmap or not or how many unique assets your using its very likely you will hit a memory cap at 5 levels as mentioned above. If you are dont lightmap and use a very few selection of assets for all maps you might get lucky with more. This is however a known bug so I'd try not to shoot for that many maps just yet if you intent to release anything soon.
To Setup Multiple Levels
https://www.youtube.com/watch?v=PiU9xhE5jsk