Love the the beginning phase of this engine. I hope you can put the time into it for further development. There was/is a great engine for Android, called Rokon (Java, Java, Java), but the developer got busy with real life, so it faltered for a while. If you can accomplish the same things in the B4A environment, you'll have a huge hit.
One thing that seems to be difficult for many and would be a HUGE help for any game is sprite collision detection. Circles and Squares are easy but Sprites, with their organic shapes, are not.
Keep up the good work.
Cheers,
Sterling