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!