Lol I just left a comment over on reddit about re-wording the restart and quit options. Maybe another option to think about is if you double tap a tile that has been placed it will go back to the standby position. It can been kind of rough using a mousepad.
The only problems I saw were the amount of times I got the upgrade for the backwards shooting capability. Also it seems like when I'm touching the upper wall the backwards shot slows down exponentially. Then I move and it goes back to normal. Other then that it is a great game!
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I saw it. Thanks for feedback and ideas...