I always regret buying 'More time' upgrades and I always forget. It just makes the game loop longer without any tangible benefit, so you're making the game longer just because. Maybe a little bonus, but you can always just restart the level and go again quickly for way more than extending the timer. Anyway, just a small thing, as for the game, cool, enjoyable, not that innovative/satisfying/engaging... edit to 4 stars, the UI is great, very responsive. earned one more