Amazing little game! Very fun, and very hard too. I was absolutely demolished at wave 10. I didn't have a healer, so the one time there was no vulnerary at the shop I was screwed. I'll definitely keep playing.
The combat forecast felt a bit wonky, sometimes it showed an enemy would receive no damage even though it did get damaged once I attacked. I'll test more.
Edit: Yeah, selecting an enemy sometimes doesn't show the damage it will receive. When that happens, moving the mouse away and then into the enemy again fixes this. Maybe it's a firefox thing.