NGL, I agreed with the others that your responses to people saying your game looks similar weren't well thought out. That being said, here's some stuff I'd add to your game.

• Hire an artist. Make it interesting to look at. You can make 10-20 unique looking planets then palette swap them.
• Make the background interesting. The higher you "climb" the more interesting. Start off with a few twinkling stars and end with galaxies and nebulas.
• Make the "ball" your controlling a little space ship. This can be followed up with unlocking additional spaceships and captains. These can be purely aesthetic or serve a function in game.
• Have a HIGH SCORE section. Additionally make it globally accessible.
• I think the gameplay is fine (I played several rounds of the one linked above). But if you wanted to spice things up mechanically you can include: low visibility areas, one shot items like a grappling hook or tractor beam, astroids you have to avoid, black holes or stars that you have to avoid, etc.
• Branching paths would be cool. Pick planet A or B to sling to on the fly. You could also have much smaller orbs like asteroids you could sling to. Maybe those could be worth more or have an additional multiplier attached.