Oh my! I made a grave mistake! I archived the game with the settings set to "Small window". Consider me a hasty fool!
Pressing F1 and changing to fullscreen will do the trick, I will nevertheless make sure that the next version will have this set to default!
In regards to your feedback: When reading this, imagine me bowing down to your kind feedback and actually chuckling regarding the obituary part. Could have spent more thoughts on the demo ending screen, even if it actually kinda plays into the spoiler spoiler spoiler. OK, I better shut up now, until the game is more than just a demo :)