1 hour ago, Kleric said:

how one might deal with personal biases when considering gameplay ideas that they believe would be good. I realize that the ideas I come up with and have attachments to may not have a broad connection with others, or I'm not thinking of the full picture enough to see that it wouldn't fit or work. I know ideas and concepts being good are mostly subjective, however there are still ideas most people may consider objectively good or bad.

Open-mindedness is a necessary virtue in game developers in general (including solo developers). 

I would compare my designs with both old school games of the genre and modern takes of the genre to see just how different or similar you'd be compared to the two extremes. If you see your designs closer to an older generation, then I'm sure an audience of young folk would think it'd be strange, and vice versa with older folk for designs that lean closer to the modern interpretation.

Now, if you see your designs incomparable to both extremes, then maybe you're making stuff that most aren't used to, but that doesn't mean it's not fun. It just needs some getting used to or a better polish to ease into the mindsets of players. There are plenty of gems out there that are certainly dissimilar to many games of the same genre and take some getting used to, but I've seen them work. Xenoblade Chronicles 1 and Danganronpa are popular examples of how an RPG and a Visual Novel can start out awkward but feel great later.

It's quite common among successful indie developers to use a highly iterative process: that is, you rapidly prototype your ideas and variations on them to see if you can "find the fun".  If a basic prototype isn't fun, it probably isn't worth expending resources to create a full game.  There's a good article by Daniel Cook on "Evolutionary Design" that covers this process using a board game as an example.

Sharing your ideas and getting feedback from others can be a valuable starting point that will help you quickly find obvious flaws or areas for improvement.  Comparing to existing games as a reference can be informative.  In my opinion, however, nothing will compare to actually prototyping the idea so you (and preferably some others) can actually try it out and really see how it plays.