As it is, this game is interesting enough of a challenge for just enough time that 99 cents for the curious player will not feel like a waste. This game does do a great job at making the innately-difficult concept of controlling two characters at once feel accommodating.
It's more difficult to explain in words than it is to play. Everything about this game is beautiful, from the smooth touch controls to the aquatic zen-like sound effects. It's addictive as can be, and the difficulty is just right to keep you coming back for more. There are several game modes, each of which is unlocked by a high enough score in the mode prior.