You can create anything you can imagine with this engine (as you can with most engines) The reality is that you will be limited by your programming, level design, texture creation, and model design ability with this or any engine. There is no perfect engine available and they all have limitations somewhere. The best thing about this engine is that it allows development of 2d, 2.5d and 3d applications with the same engine.

As for large games (we have all heard that before from new users) here is the best advise that can be given: start small. If you have a large game idea you need to write it down so that you do not forget it. Then start with some simple levels two rooms and a door for example. Because you want to do everything from scratch that would let you workout basic movement and doors. The older A6 templates would be a good place to start looking at how to do that.