Secondly: I think it would be more convenient for people to choose when to respawn, rather than spawning as soon as the count down is done. I find myself needing to tend to things around the house and then coming back to a horrific score because of constant spawning and dying. I think you should have the same countdown, but once it hits zero, you have to click "Ready" to enter battle. (Something along those lines.)
Just a few things I noticed that bothered me. Besides the small amount of graphic options, and other small things, the game is great fun. I'll post other things I notice on here.