This is simply gorgeous. I really really love synth and jazzy piano together, such a nice complement, especially with the drums throughout. I love the piano part at 1:12, but I think a change in drum rhythm would add to the transitioning here! ^ ^
I can imagine hearing this being performed at a fancy restaurant. It creates that sort of homely and comfortable atmosphere. The transition to the drum and bass part, as you've said, is really quite sudden for me. I think separately, the more reserved section of the song and that part are both amazing on their own, but for me I feel as if the d&b cancels out the atmosphere that's been created. Perhaps less repetition and more variety would help this piece out!
I think that you are extremely, extremely talented and totally deserve to be this far into the competition and proceed further too. It's an honour to hear your work.