Glad you liked it. Actually, it was possible to get all of the items on map 16 even before the new map, it was just really confusing and difficult to do so.
Not being able to get 100% kills in levels where enemies can use teleporters is a new one; but I'm no longer updating this game, so I'm afraid if that error persists, it will unfortunately remain unresolved.
It should be possible to get 100% everything on every level. If memory serves, the Doom level only features powerup items which count as treasure. Score is given completely from enemies in that one. Some of the secrets are hidden via switch walls, and they house the missing items. Enable the Automap if you have problems (which may need a brand new save game file if my memory serves).
The level with the 3 girls was one of my favorites to make. The music is the exact same song, just different samplings. The MIDI version is longer; the .OGG version had to be clipped to be converted to .IMF, which was then converted to OGG. There should be a feature to change the music, though it may not work to change it while in a current game.