I thought it was a really good idea. You took a tower defense game and made it a "deadly" gameshow. I enjoyed being able to place my obstacles and traps in various areas. I did feel like at times though the timer was too long and I found myself just sitting there watching the same thing happen until time ran out.
But I love the idea, it was engaging for a couple of levels and I think if maybe I didn't have issues with placing the objects sometimes and the controls were a little smoother/more responsive, it would have been twice as engaging.
Well done!