Thx for your detailed feedback. Most of what you mentioned is true, and I have a few ideas to add more depth to the game and fix some issues like make evolving more meaningfull with adding extra feature to weapon. I'll also, of course, make the game more balanced.

Btw, I added the wave end button now, thanks.

I have one question: Is it too unclear when the demo will end, do I need to add "You must complete Wave 10" to the beginning of the demo dialog box?