Appreciate the feedback. Was a tough call deciding how often the enemies should attack vs. move - will definitely take a deep look at difficulty tuning if I continue to develop this concept. Thanks for checking it out.
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I'd also like to suggest making the bombs hitbox bigger - more often than not I missed the bomb but a few pixels, resulting in not only the bomb exploding, but also me hitting (and potentially destroying) the block right behind it, causing even more destruction than if I wouldn't have tried to remove it. Or make my bullets not hurt the blocks and give me a different tool to remove them. Or make it hurt the blocks less. Or... I'm sure you'll come up with something. :D