The game is finished and runs now on mobile ios and android. i added 2 panels for better performance. sprites that do not need to be rendered are rendered on the back panel. i get excellent results on b4a (pixel 3) and b4j. b4i also gives nice results. the game runs smoothly. i have set it to 45 frames because that is enough for such a game.
b4i is known for having issues running games using canvas only but it runs really nice in my opinion.
so if someone is interested the source can be purchased now!
EDIT: i will be able to send the source only next week!