The reason for the OWWs not working is that their Index (Z-Ordinal) is higher than 15. All objects except for the entrance don't work with a Z-Ordinal higher than 15. Also, the exit in level 'Pillar' is not accessable as the trigger area lies too high.
Overall, a nice set of interesting levels with a couple of them would suit the remake very well.
I quite like the idea of 'Fiery', but my favourites are 'Diamond' and 'Lapland', with 'Pillar' and 'Arrows' following. The former two, especially the first, took me some figuring. I think 'Arrows' has a couple of possible solutions, and 'Pillar' has a backroute going through under the pillar. 'Magic' uses a very nice idea, but the solution is not as interesting.