A learning experience. Although ambition might be too large a word as that would imply a grand plan, when it was more about throwing stuff on the wall and seeing what sticks. I had the impression ten world might be too much when there was code to write as well. While some things were generic and could be thrown in from other projects - that's why you write modular code - others like save/load system, inventory/equip screen and environment GFX system were mostly built from scratch.