I like the bee concept but I don't like the interactions you are suggesting it to have. It sounds like just another pacifier for the kiddies who go on and on about stickmen. Honey would be useless so try to think of something other than killing stickmen that the bees could be used for.
Magnets: for the love of god, No.
No more 'splody things' either. We have so many of those already. If you think the game needs more 'splody things' you have not experimented with all the elements fully. As for cluster firework, that is a 'splody thing' be even worse it is a 'splody thing' that would be completely and totally useless. I could replicate the results of what that would do with the elements already there and a little creativity.
The turbine idea sounds good for exactly the purpose stated. I have always thought that detector wall was kinda cheap to use on a bad reactor and still get good results. I don't know what else you could use it for, but there has to be something.