very well quality game, 5/5, but the game play is only about pressing the units button on the right time... I think it could be made more strategy based, so you can diside more about what your units do.
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sorry for language, im dutch
maybe its a nice idea to make a timer which starts next level automatalcy (is that the right word ??) so that you dont have to press next lvl al the time.
Of corse with a on/off button xD