First: to "Ghost the nuker" I think that any educational game will be hard pressed up against the other games that you have purchased and reviewed from the Mac App Store. "Call of Duty" and "Modern Combat." A child playing these games will find any educational game "boring." Moreover, Times Tables Warp has helped many children learn their Times Tables, and guess what, it's work. Yes the game is best used the night before tests to study the times facts that will be tested the following day. It is not "Call of Duty"-- a game most folks play for hours at a time. Also, you do more than "shoot things." Firing at asteroids is optional; reviewing and testing your times tables is the focus.
Also, you wrote that you would rather go 2D. Does your son feel this way as well?