It was a lot of polishing but we finally set up our publisher page and submitted the Danmaku Engine to the Unity Asset Store. The Danmaku Engine is a plugin for Unity to easily create complex bullet-patterns for 2D bullet hell (jap.: "danmaku") games. It can also be used for spawning and controlling the movement of enemies, power-ups, etc.
The submission guidelines say that most assets won't make it on the first try. We also read this many times all over the web - but our plugin got accepted straight away! This is amazing!
You can now easily create incredibly complex bullet patterns for your own bullet hell- / danmaku-games. Check out the showcase to see it in action - also feel free to create your own patterns.