Thank you for your feedback! <3
The Level 5 bug you mention might not actually be a bug, but a really weird solution, that I really didn't think through. I link the solution, if you're curious what it is.
You're absolutely right about the visual side of things. As you see, I'm not the greatest artist, and the visuals mainly are there to not just be red and blue rectangles. Next time I think I'll give more time to visuals.