For me, the amount of content and whether the games looks like something I will want to play over and over again always determines how much I'm willing to pay. There's been a lot of ~AAA~ games that cost $60+ but have main campaigns that are done in 30 hours or less if you rush, so I never pay full price for them anymore. Otome games with branching choices have a greater amount of replayability and the amount of content is always worth paying more for. Plus, you're supporting indie developers who put out far more creative content than bigger studios these days. This is a very long way of saying, based on the trailer and the sheer volume of content that you're putting in, I'd pay whatever you want!