Loved the dual purpose design here :D. I ended up stuck on the level where you have to walk to the other side (there's an arrow made of boxes) and a double sling jump to a point where there's a door that only opens if you are attached to the blue plug socket. I couldn't work out how to proceed :(.
Happy to continue if you give me a hint :D. It was really fun and the music was great, although the web version didn't work for me and I ended up with slightly too many overlapping sound effects in the end, so I unfortunately had to mute the sound :'(.