There have been loads of updates and bug fixes in the past week or two!
First thing to note is that the Steam Overlay is working :D
Beyond that, there have been dozens of fixes to Interstellar Invaders!
- Two-player CoOp mode is available from the start of the game
- You can now access CoOp mode from the menu screen mid game
- The first boss has been updated to have additional obsticles in CoOp mode
- Colors work properly while in Inverted mode
- Other bug fixes that I can't remember!