This is a big one, so bear with me. By and large, the creators of the most successful IGF entrants picked one or two things that they wanted to do and poured all their efforts into doing those things really, really well. This is generally thought of as a good design approach, but in practice it runs counter to what we generally consider desirable in the RPG sphere. Among RPG developers, open-endedness and player freedom are highly valued. This has its roots in the traditions of the pen-and-paper RPGs that spawned the genre: we want the player to be able to go anywhere, make consequential choices, and play the game in a wide variety of different ways (a.k.a. “role playing”).
This means that your typical RPG features at least half a dozen distinct gameplay systems to suit a variety of different gameplay styles: item collection and management; crafting; dialog; stealth; combat; magic (typically with a number of different sub-specialties); character building (both in terms of creation and point allocation/skill tree navigation); and oftentimes, gambling (simulated with stat rolls, or via a full-fledged card or tile-based mini-games). That is a lot of stuff to have to do and do well; for a solo developer with limited time and budget, depth and polish can easily end up getting sacrificed on the altar of breadth.
