id say think of patreon as a means of not allowing the passion to fall. when you have a thing to strive for (releasing for patreons) it gives you as a developer/s a reason to continue. not to mention its easier to follow up on updates and what not as the players.
also dont sell yourself short man, this game is great i would never call it unprofessional, have you seen some of the other garbage people are trying to sell on patreon? you have a fantastic game on your hands and id love to partake in money monthly on patreon to support, even if its a passion project. if your worried about not wanting to charge to much just make the cheapest payment like 1-2 $