I realize that I should have added a screenshot showing that the black rooftops are just regular house tiles. I agree with you that without the full-screen/higher resolution that had been planned for this + some shader things, it's that much harder to pick out everything in the scene. Would have loved to have had the time to build out a proper tutorial, and the UI on the right is entirely unimplemented, which is more of a scope issue. Lessons learnt on exporting far sooner than we managed to this time.
Lose state of the game: It may be that you let too many houses get destroyed (there is a /4.0 gauge at the bottom of the state list with the people icon, you lose a full heart if you forget to activate bunkers before a raid, or 0.5 heart if you let a house burn) , OR had only one unit left on the map.
Thanks for trying it, and for the feedback!