It is a good memorization game!!
Its one of my favorite types.
The hourglass could give more time, because now at some time, even if the player complete the levels at the ideal speed, they will not be able to go very far in the levels.
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Happy to hear that you like it :-).
And yes you're totally right. I should have increased the bonus-time. My calculation was done for forward and back + a little extra time. But if you've to do one turn you loose time. I wanted the player to loose time during the game but this is too much because it is nearly not possible to build up time.
My goal was to make it hard to reach the (afair) 6th level. Because from then on I don't add any rows anymore. I think I've simple overshot.