Quake and UT are highly regarded as arena shooters. the controls are snappy and they offer a high level of polish. Back those 2 and nowadays take BF and COD and no mid-low budget shooter will be able to compete unless they do something really unique (i.e. Portal).
if an indie shooter is ‘just another shooter in a world of shooters’ as Kris says, and given that the indie game will most likely be inferior in every aspect to that other AAA game, if it doesn’t offer anything unique I see no reason why anyone will pick the indie one over the AAA one.
In your case take Tomb Raider, Uncharted, Deus Ex, Metal Gear Solid or Quantum Break. they have good stories, good art, good mechanics, and offer a great experience, and can be bought for $30 or less if you don’t mind it not being the latest in the franchise. so (and again, I haven’t played your game) why would anyone pick your game over any of these?
or people will just play that $50 game that came out 2 years ago and is just now discounted to $15-20 on a Steam sale. even being 2 years old will probably give them more value than some indie game that came out this year, if said indie game isn’t doing something unique.