Maybe try different variations, e.g., you can only take spheres from within a single column or row, two different colors, etc. Also, get rid of the Matrix theme - the game should stand on its own without using someone else's stuff.
At first I was confused by infinitrion's analysis of this game. It took many hours of careful consideration, but I finally see that no further description is necessary. Infinitrion has perfectly captured the majesty and grandeur that is "Jigsaw 2.1" with a comment that is so subtle as to be sublime, if not entirely insipid. Thank you, infinitrion.
Awesome retro goodness. If you fondly remember the days when every mall had an arcade full of games that only cost a quarter each, you will like this game. Nice mix of Robotron, Galaga.
Good typing game. Seems to get confused about which word you're "aiming" at sometimes - a couple of times it killed enemies for which I wasn't typing the word.