I have created more content for the level 2, I feel I have made a lot of maps (94 maps in total) but the number of puzzles to solve is a lot less. So I am adding more objects to interact with, make thing a little harder in the level.
I think some maps have nothing to do other than link two maps. For example, in Machinarium, there are 30 levels and one map = one level so the content is rich for each a map. For the level 4, there is a night mode so each map is already more interesting because differents things happen during the day / night.
I have a lot of troubles with the audio for the game. I keep trying to fix bugs but everytime another bug appear and I am redoing the entire system. Hopefully, the audio is really done this time.