Yep, that's it!
Its graphics capabilities are not going to win any awards at the moment, but there is something you should understand about Castle engine. It has been developed by 1 person for several years, which focused primarily on whatever he, personally, needed from it. The creator has recently expanded the development by hiring a team of something like five more people, and they are now showing great advancement of the engine's capabilities every few days. I think by maybe a year from now, Castle could become competitive with Unity/Unreal/Godot, if they keep up this level of progress. Structurally, it seems very solid as-is.