It's great that you now sort of "know your genre".. a hard game.. like other people have commented how some people like hard games...
I'd focus on your game's strength (the fact that it's a hard game) but with that in mind -- be aware that when someone puts in that much dedication and energy into beating your hard game, you should really give them something for it... I'd look into ways you can reward the player. Like how on here someone posted a screen shot of "Let me know if you get here" which is a great type of "bragging rights" kind of thing. You could do a cool animation or short piece of music..some fanfare.. other reward type things.. unlocks... or even something unique for each player? maybe a clever banner or saying.. just an idea... but the idea is your game can have the identity of being a "hard game" and if you are able to make progress in it, players will get a good (rare) reward.
I think if you ever release it on Steam, one of your game's tags should be "Hard Game".. I'd "go" with that as much as possible..
cool.. good luck!