Nice dynamics after 15-20 waves, projectiles are tricky, love it. But i believe you need to add more speed for melee enemies, they seems almost useless, especially, when range enemies don't spawn. 
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Nice record! Yeah there is a ‘risk’ you can take that speeds up enemies, so that’s why I didn’t make them speedy from the get go. They become more dangerous in large numbers by design, they work best with the ranged enemies to split your focus to try and get you that way, I’ve found. Appreciate the feedback though! Definitely room for improvement.