Somebody can help me how to create a better spawn system than the one used on the last version of my game ( link: http://www.scirra.com/arcade/action/11817/take-to-heaven-demo-25)
It's a timed system, that spawn the enemy after 2 seconds that the first one dies (obs: I can't spawn more than one enemy of the same kind in the same time and I don't know how to fix that too) outside the "window screen".
If you want I can post a printscrren of the event sheet.