Pretty good game
I would give it 5 stars but there are some flaws that make the experience imperfect.
The technical issues: there is no button to mute the game and no ability to stop the ads even by pay for it. The ads are really annoying.
One gameplay issue: the colour changing of the central sphere could be more predictable and it should iterate on all the colours before repeating a colour - sometimes I need to tap more times than the sum number of the orbs to get to a specific colour.
But otherwise it's great.