The concept seems interesting, though the difficulty ramp up feels way too slow, I only felt the enemies getting slightly faster after a couple minutes and it still was nowhere close to challenging. It could also have more of an incentive to use the matching mechanic, as it's riskier to pull off and does add challenge but most of the time doesn't offer that much of a benefit in comparison to just shooting away at the enemies. Still a cool idea, though.
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First, thank you for playing long enough to notice the enemies get faster! I didn't want it to be too hard so made a slow default and intended to make a difficulty setting but didn't get to it. Totally agree on the incentives too, I had plans for things like power ups to do things like carrying over damage but didn't have enough time.