With just watching the video, Id say you have a well-working core tetris-like mechanic in place. In addition you have many other levels: selecting the water area, a column where the fish are placed ( did not quite get the meaning of this), shop and the victory point cards. Without actually playing, my maybe not that well informed opinion is that the game would benefit from reducing the number of these different stages and placing more emphasis to well working core, the bag mechanic.