Love the puzzling, but $$ is quickly required to advance
The inevitable failure effectively remains such unless you are willing to buy your way out of the impasse, and the coins are not cheap. I would have been more willing to invest in the game if there were a decent amount of content (I.e., more than 10 stages) to complete prior to luck inserting itself as an uncontrollable factor. Uncontrollable, that is, by means other than your wallet.