Hey Verganon! Thanks for your feedback, glad to hear that you and your girlfriend liked it. Weird bug indeed and so unfortunate that it occurred twice in a row. We will try to fix this so you can finish the game. We will keep you updated on this. Cheers!
That would be great. The Game still runs and you are theoretically able to restart the mission but it's not playable due to the blur. I just uploaded a short Clip on my Dropbox, so you can see what exactly happens and maybe find a way to reproduce and fix it.
https://www.dropbox.com/s/ah00s5c9srdwvw7/BossBug.mp4?dl=0
Also, here's a little Picture how exactly we played the game. I think it is the way it's meant to be played :p