The visuals are pretty cool. I really like the sword (it could've used some motion while walking to give it more depth, but it still looks really cool) . The walls of the maze are neat, but they can get a but hard on the eyes after awhile and it can be pretty disorienting when you're looking around quickly. The maze randomly generating each time is a pretty cool interpretation of the theme. Unfortunately, the game is way too long. After almost an hour of playing I had only made it to level 14. This was diagonal sprinting through all the enemies and using the maze-navigation algorithm to find the exit as fast as possible. I think the game could've worked much better with only four or so levels and some more distinguishing factors between each new maze and level (different colors, enemies etc.).
But with that said, the maze generation code is pretty cool. As someone who's tinkered with it myself, I know that's not easy to get working and it seems to work well. Also, I like the concept of having to find your way through the maze, but you can't just brute-force it if you die because the maze changes. I also really love the black hole death animation. It looks really neat and it illustrates what's going on pretty well.
I think some improvements could be to make the maze a bit cleaner visually and add some color variations to make each maze feel unique and varied. Also, making it so you can't run through enemies and making the mazes a lot smaller would focus the gameplay more on combat and less on running.
Overall, it's a really cool idea that has a lot of potential with a few adjustments.