I also didn't quite get what the game was really about, however, i did understand that the game is a sort of pin ball styled game.... this one though has the ball being shot from above and enemy or objects ascend rather than descend. The UI with the numbers at the right hand side are your attacks... well i guess the numbers are actually your currency/ cost for the attack. when you run out of attacks, you'll have to click on the big red button on the bottom right to let the enemy have its turn....
I didn't go far but so far, thats all i understood about the game.