You have to look at how your game competes with the huge amount of great free games on itch. Why would someone pay money to play your game over any of the thousands of free games available to them?

I would take a look at 2 things: your icon (and how it stacks up against other games in the browse sections, most of which are gifs and explain what their games are right away) and creating a trailer. There aren't many people in this day & age that would spend money on a game that they haven't seen in action, either through a trailer or being played by a streamer.

For specific feedback, the tiled star background and the game-mode icons in the screenshots make it look quite amateur. If I were you, I would probably make the game free, learn from player feedback and try to build up a bit of an audience, and find a publisher to work with for your next commercial game, as they'll be honest with you about when the game is ready, and provide lots of playtesting and marketing support.

It's a tough industry for Indies right now, and it can feel really unfair because just finishing a game is so hard on its own! You're off to a great start though, and I hope you'll keep at it!

"If you have an answer as to why our game isn't selling then please reply."

You must have some kind of notion as to why. 

The problem is it's always nice to say "Hey, you made a game. That's great and not something everyone can do." but you're asking for peoples money now and you have to meet a certain set of criteria.

1) $5.00 for a 22MB game?
2) Average Session - about half hour. There's pretty much no replayability to your game. So, essentially, you want to charge me $10/hour to play your game. 
3) $5? should be free. or $1 at most. look at what you're competing with: https://itch.io/games/5-dollars-or-less
4)  "This game will be updated from time to time to improve the gameplay and your enjoyment! :D" but it's released? not in development... so is it finished or not? Why did you publish it as "released" if you know the gameplay needs improvement?

I don't want you to think I'm attacking you or your game but sometimes the truth isn't always pleasant.

You could always try to build a bigger following first with some free games. Once you know you can build games people want to play - then you can think about charging for them and it's a lot easier if you already have a niche audience.

tl;dr - you're asking for a lot ($5) for something that has less value when compared to what you can buy for $5 on itch or on steam.

But this is just my opinion so feel free to ignore me.