1. Sometimes entities don't get copied across t the standalone, if it misses some entities then you need to copy them across yourself and it should work.
2. Custom variables do not copy across between levels, they are not designed to at the moment, only default variables like health, weapons, ammo etc will copy across.
3. Long loading levels aren't really a bug, they're normal for GameGuru, this should get better when the DirectX11 updae comes out.
4. With AI it's a two fold issue, firstly some bits of AI are very broken at the moment, again with the next update there are quite a few fixes for AI, and secondly the AI scripts aren't the be all and end all of AI, they are very basic scripts, that do very basic things, more examples than actual finished scripts, they can be scripted to do a lot more advanced things, but you need to know how to script them, just like most other game engines.
Primary Desktop:
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
Secondary Desktop:
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
Laptop:
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.