I finally had time to look into your wrapper. I love it!

One bug I noticed:
The ent_nextvertex() method of the ENTITY class doesn't work if null is passed for the first parameter (contact). Although this is possible in Lite-C!

The most interesting example was the embedded engine window example. One problem I noticed is, that even if the parent window (the window the engin is embedded in) is active, I need to click into the engine window so that acknex detects my key strokes.
Is it possible to activate the engine window when the parent window is active?
I also didn't managed to get resizing of the engine window with the parent window to work... The panel is resizing correct. In the resize event of the panel I tried to change the engine resolution to the current panel size... without an effect (I used the threadsafe event of your scheduler of course).

Really great work!