Nice game, needs maybe a little more work.
As said before, the turning of the stage is a little slow. I'd suggest maybe adding some function to speed it up a little (hold down space bar to increase rotation speed or something like that).
Maybe an overall map of the stage, in case you're missing one or two things and you don't want to spend the time to go back through the whole thing. Seems like a solid game on the whole, though.