Good game, I like the upgrades, and once you learn the shift trick this because exponentially easier. Still difficult enough to be fun.
There is a MAJOR issue with the clicking, at least for me. It seems whenever I need to click on something badly (a tower, or a meteor to save my Brilliant round), I'll click on what I need but it won't show up to build or shoot. Some tinkering needs to be done to make clicking respond better.
Poorly worded question considering all of the answers are technically correct... Game gets a 4/5. Sometimes I could just turn all lights green and sit and I would win. Pretty much a luck based game.