I'm glad you enjoyed the demo! :) Sorry about it not saving, that was something I realised just before the upload :(
The swimming controls were introduced much later into development, and is something that I could refine somewhat.
Haha! Well done! I was hoping no one would find a way up, even though I discovered a way myself. So I did leave a little treat up there just incase. Guess I'll be adding some invisible walls. Or just block off the areas beyond and keep that area ;)