I don't know if this should be considered a bug or something a little annoying. When I reached the last wave on the first stage, I opened the warning for the new type of enemy when the "Last wave" message was still visible, and I couldn't read the warning because the message staid in there. I had to exit from the warning so the "Last wave" message could fade away. Besides that, it's an excelente game.
 "Sky Garden"){kind=icon}
 "Monsters TD"){kind=icon}