Glad you enjoy the game! And thanks for taking the time to say so – it made my day!
If you like this system, check out Button Shy's AdvanceQuest, which is the same system with a few new adventures, and Welcome Aboard, Captain which is a sci-fi solo RPG that uses a similar system with a procedural mission generator to create a Star Trek like experience of being a starship captain.
There are also some people who have made fan expansions for Dungeon Hero. Check the devlogs or search itch to find them. People have contributed some fun stuff!