@andymc I liked Marble madness and especially Spindizzy too. It was really fun and a great challenge to get somewhere in those games. I might go with the gameplay that adds more time when collecting a crystal, or another option is to collect a certain number of crystals to complete the level. I cannot decide which yet. Or perhaps I can implement two game modes that would be fun. Both games was fun so I will try to combine the best from both games. I plan to remake some of the level design from the original games and add moving platforms that moves up and down so that it creates dynamic levels. The slopes with space between was much fun and I will try to implement that as well. The control of the ball is much smoother than in the above mentioned games but that only adds to the gameplay. I will try to solve the side texture problem at the end of objects so I'm still learning Unity. I might have to purchase some assets to make it as good as I would like to see myself. About your game, it would be nice with variations in the sine movement of the enemy ships. I've been thinking about this myself for a space game I started a year ago, it was what was to become a Star Wars Arcade game, but it ended up as a playable demo much like your prototype, but with Star wars ships and sounds. A license from Lucasarts will be needed to publish a game like that, so I had to stop working on it. I made the prototype in GLbasic, if anyone knows about this language I dunno it's probably not that popular anymore with B4X and Unity around. If you don't mind please post the sine code routine for the ship movement. It would be fun to play around with in B4X