hey fun stuff! id say this is more of a waiting game than a puzzle game. not in a bad way though just that at a certain point the loop doesnt justify the gameplay.
Id recommend a level based loop where each level requires a point limit and there was a time limit to complete that point limit.
This would give it a more puzzle feel where
A) you have to either weigh keeping a loop combo or clearing the board for easy 100s
B) actually make the sprint useful as speed is needed in a time trail
Just some suggestions but 3/5 star and a front page AND daily 4th is nothing to sneeze at. Great job! Keep it up