In unity answers, no one answered so I posted it here.
Game download like: Roll-a-Ball by Paulastya
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I’d start by adding the correct spelling of Credits 
- add a scoring and a highscore system
- more a variety of pickps worth more / fewer points
- add moving pickups
- add a points multiplier pickup
- add static obstacles
- add ramps / elevation
- add dynamic obstacles
- add an evil pickup that removes points
- add a timer
- map layout that is not a square
- maze elements
- doors that require collecting a key first
- moving platforms
- holes in the ground to fall through
- physics fields
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These are all excellent suggestions! @PAULASTYA I would undoubtedly suggest taking some of these suggestions from @Everynone and implementing them, especially the maze element suggestion. Nothing like adding a maze to spice things up! 
And if you do go down the maze path, here’s more suggestions:
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Sorry for the spelling.
I would try to add these suggestions to my game.
Thank you.
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