Quote: "ok i have it on my pc and ive made a few levels, so far its really good but when it comes to playing, the AI takes a million shots to kill so how do i make them have less health"
Right Click on the Enemy and change its health to a lower number.
Quote: "and how do i make my level more open...cause i use the segment pieces and the ceiling is like 2 feet above my head, can you make it so that you have no ceiling?"
Move up one layer, Select the room segment and hit the "f" button on your keyboard. Than right click on the ceiling and it will go away.
Also if you search the forums you will find all of these answers as they have been asked 100 times before.
Hope this helps and enjoy!
TJ