For me the game gets those random 1 second lag spikes where it freezes. Given this is a game of percision, I have an excellent computer, and the most up to date version of flash I cant give it more than 1 star. Its frustrating not because its difficult, but because its glitchy.
Amazing game, I have but one complaint: When upgrading towers you can not see the current towers damage. It should show current towers damage and what it would become after an upgrade.
id give it 5 except having to wait 5 minutes to take off again to try for the 100 space stars badge is kind of a pain... especially when you buy all the upgrades and are bouncing around forever. I am actually writing this review while waiting for my turtle to finally stop. All in all its a great game though... just add a kill switch. 4/5
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