Balls, balls and more balls. Throw many balls and activate cannons that will throw more balls, destroy the cubes before it's too late and get as many points as possible, are you going to let the cubes destroy you or are you going to destroy them?
Estimates — owners use the Boxleiter method (reviews × 32), wishlists proxy followers × 12, revenue uses ~62% of list price × est. owners. These are rough industry heuristics, not official data.