I reached wave 13 with maxed out upgrades and 60% purity still, and then I mashed click so hard I accidently closed the game lol. This game is amazing and totally deserving of the popularity. I hope this gets featured in the gmtk video! I think the music gets a tad repetitive but the art is amazing and it's super clear on what to do. When you upgrade your stats enough to click dozens of tiles at once, it's amazing. Super creative how you keep frantically switching between attack and dig. Such a simple concept that's done so well. My biggest complaint has to be that I had zero time to breath or even read what the upgrade items do. I couldn't spare any time, so I have no idea what half the upgrades even do lol. This game NEEDS some sort of pause mechanic in my opinion. Other than that, great game.