Thank you for trying out the game! Even if its not the type of game you'd usually play, I'm grateful for your feedback!
The feedback about a fullscreen mode is appropriate regardless of the rest and wasnt a case we tested so this is good feedback! Making tiles more distinctive is definitely something that would be a learning process as I'm new to level design. I spent plenty of time trying to make the level feel better, but I think at this point a complete level redesign is most appropriate to revisit the things I've learned.