"Push Bridges" is the perfect brain exercise.
I hope you consider publishing it on Steam.
I'm considering it, after I add some more features and better art.
In the meantime, I trust the word-of-mouth of puzzle lovers :)
Steam has an "Early Access" feature for games that are not yet complete.
Even though I believe your game is complete, you could place it in "Early Access".
And let people who purchase your game know you're adding more features.
have you posted it on reddit? there are so many subs (/r/playmygame for example). and the communities there are really tight and can give a lot of exposure to your page.