Totally fine. It would be fun if there was a contest or whatever to design better levels / games for this.
First major change I would introduce would be hiding the mini-map until the player locates some kind of map item hidden in the labyrinth somewhere. (probably near the end where it's useless) I only added it because too many people who saw this didn't seem to comprehend that they're looking down a hallway without it. The mini-map is the one part I didn't code back in middle school but added when I dusted this off in order to release it. I am going to be looking at a few of the other crap projects I did back then to see if anything else merits seeing the light of day.
On second thought, maybe instead of a map item, some algorithms that light up parts of the map only when the player looks at them.
Turn the background red instead of black and you've got a Mars maze! (Maybe could re-implement the Mars maze scene from the Journeyman Project Turbo!) I also thought about making the floors, ceilings and walls different colors so as to have blue skies and green walls sort like a hedge labyrinth in a garden.
Interesting anecdote: I discovered completely by accident while coding this that walking into a large empty space created an interesting effect that looks like rows of marble columns!
I haven't touched QBasic since .... well since a long time ago. Does QB64 or whatever is the new tools have a way to let me make this into an executable that will run natively on modern systems?