It was an alright prelude (especially for a first game!), but I did start to get a bit bored after I had already explored all of the random rooms, quickly devolving into ‘running back to the nearest exit to re-roll for a potential exit room’. I guess some background music might have helped to keep players engaged a bit longer, but yeah it looks like everyone else has already said the things which I was going to say.
Still, I think that the ‘random dungeon’ idea could work in more of a roguelike structure, but pulling that off in RPG Maker could be a pain in the backside.