The Abyssal engine is exactly as it says it is (an ENGINE).
And any type of game can be created with it, so as long as you know how to program in C++, You have 3ds max and a team to make the games you want.
If your looking to make a quick game with this, it will not happen, this software is geared to more advanced programming and in fact will take a lot longer to make a game with it. This to me is the same thing as josh k's Game engine 2.0 but well different name,maker and what not.
I'm not sure what program this was written in, I suspect C++ though.
Where as the leadwerks game engine was writen with BlitzMax. (another BASIC programming language but with better features)