This is so neat and works well. I hope you'll continue adding to it in the future. I went through wave 4 or 5 before I stopped, but I could keep playing this all day. It reminds me of Robotron: 2084. Upgrades and different maps in a complete build?
Actually, it has an ending! The game only have 9 waves. I forgot to put something to inform the player that it's not endless and there's an ending. Anyways, thanks for the feedback! I appreciate it!