There is so much potential here, I hope you will find joy in developing this further. The dungeon crawling is really good. Running on WinUAE, sometimes I double turn when turning around with the keyboard, but that's a minor nitpick. I really like the humor in your game and I literally laughed at your gosub joke (I'll leave it at that as not to spoil it).
I know that you feel it's just a tech demo, but to get it as far as you have in such a constrained time period is nothing short of astounding.
Great job!