Great to hear you are working on a mini project
Currently the is no export to exe feature but using the editor in play mode will give you a close comparison for performance until we release the exe export. We do all performance test in the editor as this was part of the original design plan, to save time when testing your games.
There are many thing you can do to get a good performance if you need help optimizing we are here to help.
All Game engines require special techniques to get the most performance out of them. Some engines have built in tricks out of the box others you have to know what do. We have used top engines and slowed them to a crawl with very little in the scene then performing optimization techniques the same scene will run very fast.
Performance tricks:
Lower your textures to as small as can be but still looking good from the players position.
Use dds textures with mipmaps
use a shader without normals if they are not needed.
Use low poly meshes ( lodding system will be available soon)
Careful use of visibility.
Use the correct shadow settings.
Reduce light ranges ( new shader next release)
reduce number of lights. ( new shader next release)
Use smaller terrain sizes.
Once you have the level we will help you to get the performance the best it can be, you will be very surprised