Very creative - I loved your theming and the concept of the game was fantastic.
Early on in playing my character fell on his side. I spent 10 minutes trying to get him to stand up so that I can stack vertically. I was stacking on my side, but I was stacked as a long snake. I found out how to stand up after reading these comments. Maybe have the start place knock him down, then use the LEFT SHIFT + WASD keys as a quick tutorial. Trying to figure how to jump or climb would be another great tutorial
I can see where you were going with this. Had I been able to figure out how to get vertical again, I'm sure I would have played this for a long while.
Several times I did fall through the matrix how ever.