Hi,
Really glad to hear you're enjoying the game and have played so much of it.
The first two points you mentioned are bugs we're aware of that should be fixed soon.
The third point I've not heard before. Do you mean the walls are actually transparent on that level? If so please send me a screenshot, they're definitely not supposed to be. I have had a few other people complain about the intensity of the black/white palette, so I think I might change it so that it only shows up in the tutorial.
Thanks very much for the detailed feedback. See you on the leaderboards.