Seweryn: Strategy, rpg etc they mean something describe a game in a way, inform us what can we expect from a game, but indie doesn't inform us of anything.
RPG is a bad example here. I have seen the term used to refer to games that play nothing like what I consider to be RPGs, such as the Ys series.
In particular, for someone who loves games like Lords of Xulima and Elminage Gothic who is looking for another RPG, I would not recommend any Ys games, as they play completely differently.
Indie, as a category, also has this problem. Crimzon Clover and Lords of Xulima are both indie games, but they are extremely dissimilar and I would not recommend one game to fans of the other. There are AAA games that have more in common with Lords of Xulima than Crimzon Clover does. (In fact, it would be hard to find an AAA game that doesn't.)