I've just got an Idea.
I will create many tilemaps.Put the first one on the screen and others away from it.Each assigned with bullet behaviour.
Then at rhe start of layout I will pick a random tilemap and put it at X-axis,320(level width).
Again after the picked tile map reaches x-axis 0,another will be picked and so on.This should be a loop I think.
The problem is how to get the UID of the randomely picked tilemap.
Is this a good idea?
This should make the game infinite and the java game actually works this way.I see many areas repeated.
I don't want to make the game difficult over time(Or I will think about it later)