would be fun but controls kill it
The rectangle could be selected with only two corners, having to click all four corners gets annyoing very fast. However, if you could improve on this, it would be a very neat game.
Very often when playing you'll start clicking and then realise (just as you're about to place the final corner) that there is a much bigger capture to be had. So I liked the ability to cancel this - using just 2 corner clicks removes it. I also thought about allowing you to select the capture area with the mouse (click / drag / ant-lines ala Photoshop). Probably should have explored that control method further.
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