I too have mixed feelings about this puzzle but for a different reason. I enjoyed the challenge and the novelty ands thought the clues were OK.
My main issue is that we had the fit the four letter answers to produce a completed crossword grid, but we had no definition or word play for the answers in that grid.
As we progressed we were expected to work out all the possible words that would fit into these partially filled lights - and some of the words were quite obscure.
I found this difficult and had to use the Chambers word search facility to identify all the options. This feels a bit like cheating but I could not see any other way to get there. Huge respect to anyone who completed this without aids.