Comments are mostly based on the earlier version, as updating would probably invalidate some demos.
Floor 1:
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×1E: I would guess that the intended solution is to do as Resert On did, and have each projection place a platform at its final location after waiting for Beethro to move to the south of the room. (It that wasn't intended, it should be.) Instead, I immediately placed each platform one tile south of the targets, and let Beethro follow.
A nice variation of this room can be with mimics instead of projections. The second solution would still work, because of the northern pair of target tiles.
Floor 2:
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×Entrance: One of the tokens is not necessary. In that case, the green door is not needed either.
1N: Must be broken, as the mirrors and some are not necessary. Are there enough tokens for the intended solution? Don't you need six?
1E: Obviously broken, as there is no permanent penalty penalty for expanding the eastern briar.
A general bug which appears in this room, not related to hold design:
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×Demos on the room say "The player is just passing through". I guess it is true that the player did not directly kill monsters, but it would probably make more sense to say something like "The player passes through the room as one monster dies".
Floor 3:
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×By now the rooms are standard difficulty, and not tutorial-like level. Nice puzzles.
1E: Invites a challenge to use as few tokens as possible. I did not use one of the tokens, and the last projection only had to clear one trapdoor, so I think at least two can be not used.
Floor 4:
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×1N1E: Nice puzzle.
1E: I didn't complete it, though I did learn that a roach queen can kill Beethro/a projection. (That shouldn't be surprising if you know they can kill stalwarts, which is mentioned in one of the advanced concepts holds, but I never thought about that.)
It looks like the projection needs to reach (28,10). This must happen during replay before the green door opens, so going over the perimeter plate shouldn't work. That means it must go through an open door at (24,13), which means the internal pressure plates should be pressed two at a time. However, I don't see how that can be done, as the queen reaches the outer plate before turn 30. I think I would be able to solve it with a longer serpent.
The second round, would then require keeping Beethro out of the way, while the projection does its part. However, it looks like the intended solution should have Beethro and the projection keeping the queen between them, while stepping on plates at the same time. (The NE/NW pair can be hit before the queen is released. The N/S pair is easy, and the SE/SW pair would need to get around spawned roaches.)
Assuming the puzzle is solvable, at least one of the comments above is wrong.
Floor 5:
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×Entrance: Very easy, but I guess it does present a new concept.
Comments on new version:
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×Floor 1: 1E: Both solutions still work with the necessary changes.
Floor 2: 1N: Looks like it needs another token.
EDIT: Of course it doesn't.
Floor 2: 1E: Looks good now.
[Last edited by bbb at 10-15-2017 11:42 AM : Correction]
But I haven't found a working configuration yet. I suspect that 
Please add a checkpoint at 19,17.