Hey thanks for playing!
It is endless, but I want to add a few more enemies to gradually come in and a boss like enemy that would be more static and take up a large part of the screen. Maybe you have to take out its tentacles to kill it or something idk.
I also wanted to add dialogue and involve a lil story, so maybe I could make a beatable mode and a survival mode. The story is that the US gov knew there were aliens on the moon and deployed you at this mining base anyway, and the reason you have to pay for earth to defend your base is because they need to make sure your mine is worth the investment it costs to protect. So it would be cool to add an ending and then display some stats like #turrets lost, #upgrades purchased, etc.