I like the idea of inverting Tower defense and with the bomb you naturally made use of the 10 sec theme. I like the look, only thing I would suggest is making the projectiles larger or more prominent. Very enjoyable, but also very tough towards the later levels.
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A few people mentioned the projectile smallness and the fact that the bullet shadows threw them off. Good call. I have a habit of making my games too hard so I made sure at the very least to make the opening levels accessible to casual gamers. Ran out of time for level design and polish but I'm glad you enjoyed it!