Hey pablo many thanks for this. It has been great getting to see the other entries!
I made the Eidolon game, sorry it was a bit unclear what to do; Holding the Mouse Scroll Wheel or Left Shift turns you into an incorporeal ghost form. You can then walk through certain walls and geometry (and enemy gunfire). Places that are important to get to are highlighted in red through walls when in ghost form so you know where to go.
I have been trying to think how I could have demonstrated it all a little better.
I hope you do get to come back to it and take a look sometime.
Thanks again