Jan Tatham ( Sebity on github http://www.sebity.com/ ) created a Common Lisp clone of the Space Invaders game on Github. This is SDL 1.2 version game and needed a little tweeking to run on SBCL on Windows. Once I got all the needed dll in my SBCL path, it seemed I could not reproduce the original error. Because SDL is now at version 2.0 I decided to refactor similar code while still maintaining a working version.

Thank you, Jan Tatham!

All the original game logic is well covered by Sebity, my adventure starts.