Koi, thanks for the kind words!
Loloy, thanks for the input! I made the enemies "catch" you in one hit because they are so easy to defeat. If you have the gun you can basically wipe out all the enemies in a level easily. The bosses take only 50 health away from you though because the bosses were too hard to kill without dying once. I know about most of the glitches but haven't gone about fixing them all quite yet.
Rjb, is this what you are talking about? http://3dmitchell.com/freeDL/gametutFLASH8.swf A level transition? Or are you talking about leaving the predefined screen height and going to the upper height level? If you are talking about the latter, it wouldn't be so hard to do but it would be more work than it is worth. I think the instant height change is appropriate to give the maximum control of the character, I may be wrong though.