1 - Strafe Jumping. It was designed that way. Use a different tactic. It makes life more interesting.
2 - Some of the doors don't work? Hmmm. Read the Readme file next time, as it states that the doors are on timers. Tut Tut Tut !
3 - Item placement. Yes... sorry. Will try harder.
4 - Lack of major items. Why make it so easy? Learn to be more accurate.
Thanks for the comments. Apart from the door one, it was fair. Cheers.