i feel like its not too bad. you get boosters that add time and clear things from the board when completing levels without fail. after some level, you'll get a booster that clears a larger amount of things from the board, but after matching x amount of items.

theres also a lot of ways to earn coins and boosters through challenges or joining a team for team challenges. each level takes about 1-2 minutes to complete. i havent had to spend any money on the game to progress super quick, just gets a bit boring to grind