I enjoyed it though it was annoying at times.
It was pretty good. If you make another one the only suggestions I have are...
1. Make more props and scenery (not to mention being able to have the water looking like it has "risen". Props from other Mario games as well. Maybe add props from other games that aren't related to Mario such as Megaman?
2. Make it so it's not always as annoying when you're putting pieces at certain points considering it would sometimes get stuck and if I clicked on something it would take a different piece then what I wanted. Maybe add a menu when you click of stuff you want to do with the item. Kind of like in "The Sims" series.
The sound wasn't really anything new and could possibly get annoying at times. Maybe have a list of songs to choose from?
There actually was some violence in it believe it or not. It was the message, if I remember correctly, that you gave to all the flamers and would-be flamers out there.
There really wasn't much humor, if any at all that is, but I didn't really expect any considering this was supposed to draw on the player's creativity.
What I stated above is actually one of the reasons why I enjoy Video Productions considering it gives me a chance to express my creativity without many limitations (if any at all), y'know?
Another thing to think of when it comes to sound (which I just thought of this myself) is maybe you could try adding voices or something? That could possibly end up adding to the humor as well, y'know?
I give it an 8 overall. I've played better games that let me express my creativity. One example though it's not THAT good is the "Create your own Sonic character" thing. Another is the "Robot Creator" I think it's called, and you could even post your creations.