The game has simplistic gameplay that feels solid, but the wave changing mechanic seems to have a couple of issues. After Wave 2, waves tend to bleed into each other, without any sort of breather between waves. Also, the wave counter will sometimes reset itself back to 1. Once, I saw it skip from Wave 1 to Wave 3, but I'm not 100% certain if that's an actual issue or if I had missed the notification for Wave 2.
All in all, a pretty solid title that needs a bit more polish on some pretty minor things. I had fun!