Leystone
Unfortunately, there's not much to say about this one. A good few screenshots remain of it, but the project has long since ceased to exist.
I tried implementing collisions using Separating Axis Theorem, to some success. Here's some fails before I got it really working.
And here it is actually working:
Here's the editor that I made for it. I remember it being very buggy and not very robust at all.
Yes, you did have to type in the number of vertices at the bottom before it would start creating a polygon.
Finally, here's the sum of all I ended up creating for this. It's super weird and abstract looking... and I kind of love it for that. But there's also no gameplay at all, and nothing really beyond this screen, so...