I have already found the majority of them, and if I don't fiend the rest I will e-mail you.
And yes, I do realize that the visuals are not everything, but I really regret using the Irrlicht graphics engine for it, because it lacks support for many key features I would need to use, and while I could theoretically implement them myself as the engine is free software ("open source"), it wouldn't make much sense when there are other, more advanced engines such as OGRE. When I started working on that game, I thought of it as a small project that I would complete in under two weeks, but then I kept on adding more and more levels and now, almost one and a half years later, I'm at the point where switching to a different engine would take too much work.