Well, from my perspective, this matter colors my perception of Sugarsteem, and will.

I note no response from Sugarsteem dev here, which is telling.

Sorry you have been disappointed in folks. At the very least, do learn from this experience. As another comment points out, your work will continue to churn out, and Sugarsteem will clearly no longer benefit from it.

As someone who works for wages, I have myself been shorted compensation betimes. I note that there is no shortage of demand for my work, and folks that make a practice of burning bridges in that way eventually end up isolated, and dependent on their own work, which isn't adequate to meet their needs, while we who produce useful work continually create bridges and increase our benefit to, and benefits from, society.

I've actually had former employers that have failed to pay (because they blew their payroll on a binge) come to me later and seek to employ me. This did not harm me. Rather it encouraged me that my work was valuable and necessary, and demonstrated to me why it is important that we do maintain high ethical standards. Those employers all vanished from my life then, and from the area altogether, eventually.

For good reason.

Consider how much mental investment this issue is worth to you. I reckon chalking it up to education cost and moving on is the most profitable course for you. Also, do learn. Don't do work for them again, even if they eventually make an effort to appease you. Don't remain vulnerable to such depredations if occasionally learning this lesson is undesirable.

In my line of work, I generally do work before receiving pay, and so I relearn the lesson from time to time. I move on. I don't stew in the emotional discomfort such lessons can create if we don't move on. Then I spend my attention on the good folks and good work I do and contribute to, which does my heart good.

Your skills and ethics will continue to provide you rewards throughout your life. Their lack of skills and ethics will continue to degrade their lives, until they themselves learn from experience. You have everything to gain by moving on and never looking back at folks and events that hurt your heart. The only thing I can see you are certain to lose is peace in your heart, and you can only lose that if you don't move on and spend your attention on the good opportunities and benefits that are coming your way.

For me, peace of mind and a full heart is far more important than grudging acknowledgement.

YMMV. I hope for your sake it does not, however, because peace is quite valuable, and in too short supply. That may be the most valuable compensation you could theoretically receive for your skill and work in this matter: learning to move on and focus on the blessings you create and receive by working with good people. I do wish that for you, and everyone.