Totally get the dilemma! I think of it like this: if it is polished "enough" to get a feel for the mechanics, and whether it is fun or not, I would rather get the feedback as soon as possible, even if there are rough edges and unfinished bits, so I can improve it.
That said, if the tinkering brings you joy, there is nothing wrong with it either depending on your aims! And there are a lot of games out there, not so easy (at least for me ;) ) to get those eyes on it!