Overall a well designed game, the colour scheme and gameplay fit the hyper casual theme perfectly, also the use of simple shapes helps complement this. Although the levels are limited there is the potential to procedurally generate levels endlessly after a certain point.
The difficultly of the game may be a bit easy, this could in turn dull the popularity of the game if it were published, but this does not necessarily mean that it needs to be made more difficult, as a leader board system could be implemented to help by making players get engaged with trying to beat other's times.
Other than what was previously suggested I found no problems with the game and as suggested before it fits the hyper casual theme perfectly.