As the title, somehow I cannot complete the last level. I'm doing my first runthrough on Windows 10. Screenrecord: https://youtu.be/wbmQ1pdZm5s

For some reason when I run the game it's just blank. The music is playing normally in the background, but nothing happens on the screen. I tried to change to the window mode. It didn't work either. Help please!

http://i.imgur.com/LAhNiLI.png There seems to be a "wall" where I've marked with a red line. It's not possible to move between those two cells in either direction. Thankfully this isn't vital to at least one possible solution, but it was very confusing and frustrating when trying to solve the level....

The game has lost my progress and now offers me the first level again. Was I supposed to save my progress manually or finish the levels in one sitting? Or have I inadvertently hit some kind of a non-obvious reset button? :)

Just curious, but is there an easier way to exit the game than alt+enter -> window mode -> X in the top corner? I didn't see an exit sign in the game and Esc didn't work.