A purchase is a permanent copy of the game. If you would rather pay once and never think about it again, go for it! SubscribeStar is an option if you would like to make a smaller payment to try it out, or to provide us with regular income with which to develop, or to get rewards like content previews and votes. Both help us, and I want to offer them both so people can make their own choices.
I completely understand your point and also the financial support for the development of more games I love this game and it's works you guys have done an amazing job I'm still waiting for the complete version I'll support you on subscribe star to see what kind of other great work you guys come up with. Is this the only game you guys have done or are there prior creations before this.