Been going at this for days now! I've been so focused completing level 20. xD I had finished everything and was on my way to the exit when I was caught just now. There was a couple of days struggle to get the game working, but installing via the itch-app was indeed the solution - and it was worth it!
I put a lot of time into playing this, it was fun for a very long time, and very interesting due to the (very cool) map randomisation. Even though I was brutally punished, I'd say my favourite maze was indeed the 20-sized. After a while, when you had explored a larger section of the map and actually had to consult the map to see where the door you'd missed were, and what path you should take there - it was a lot of fun for me who have a soft spot for puzzles and tactics.
I also think you've done an amazing job with minimal assets. The colors, movement and animations actually made me not even react to the character being "only" a cylinder. My brain was sort of tricked for a long time that it was a lot more detailed than that (this is a good thing!)
Lastly, an improvement suggestion: while it was tons of fun and adrenaline-pumping to have one shot only and no misstakes were allowed, now when I was caught the last time after a looooong period of playing and exploring, it was just too much of lost progress to restart again. Some sort of allowance for one misstake would do a lot. Like when you've opened 10 rooms you'll activate some "extra life" that would make you restart the room you were caught in, but to get a new extra chance, you again need to complete X rooms. Just a thought! I will come back to this! :D