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A new public devblog is available, please read it and vote it is very important to setup my development road.
Stronk, after reading your post and looking at your poll, I'd like to give you my two cents on the subject. Firstly, the quality of your work is not holding you back. Your story is interesting, and the artwork is equal to many projects that are 'successful'.
However, you yourself identified in the post the reason for your lack of greater success (in my opinion) while leaving it out of the poll. Consistency. I've followed more than a few games on this site, and it doesn't seem to matter for donation success whether you put out a lot of small updates really fast, or bigger updates on a 2-3 month rotation. What matters is that you can be relied on to deliver on some sort of schedule, and that the updates be of similar length and quality each time.
There's no mechanism in place to protect people who donate to the development of these games' money, and so many people see erratic updates as dangerous - they can't be sure they'll feel like they're "getting what they paid for". One month they might get an update, then they might have to wait three or four, but they're still paying the same amount either way - it makes it hard to justify the cost.
If you want to grow your pool of donations, you need to find a release schedule that works for you, and stick to it. And you need to do so with similar quality and length updates each release, and you need to show that you can do that for a while. I'm not saying this to criticize how you've been doing things. I know you're very serious about making a finished project. These comments are just based on my observations of how other games have built a good pool of funding.
I hope your VN succeeds, as I am enjoying it immensely.