I don't understand why people don't add buy 10x, 25x, 100x buttons or shortcuts to begin with. I mean this genre isn't new at all and therefor devs should know that after a relative short period of time buying units becomes a chore and players will simply leave because of this.
after upgrading everything i can't move, spawn without any health or greed, can't shoot, use bombs and am invincible. the game is totally broken for me. yeah, and refreshing the browser doesn't change that! O_o