I like the premise, but I feel the REAL fun starts at wave 6, where there are way more hexagons and they're a lot faster too. Until then, there's nothing really going on, and the timer lasts for a long while too... The punishment for getting hit by a hexagon can be detrimental if they've formed a full shell around you, especially on the later levels, as by then you're gonna have barely any time to react, and so it's basically game over. Fun game though, I liked it, great job :D