Hey! I played up to level 39 of story mode and I like the puzzle aspects of the game, but there isn't a whole lot of puzzles in the game at all. I didn't even know there was a way to lose until I got to the immovable blocks, which isn't a bad thing not having a way to lose but in this case you can just stack blocks ontop of eachother until you win, and every level plays just like the level before it.
I thought the controls and rules were very straightforward besides the way scoring works; if you drop an effective block ontop of a weak block you get 10 points but you don't get any score vice versa? I also think the score blocks are an interesting mechanic in theory, but in game it's just time consuming.
I would really recommend changing the way the player interacts with the blocks because it's very slow having to pick up blocks and drop them over and over. I think having dropped blocks combo, like what DerpieSan said, would speed up most levels, but only blocks dropped directly on top because it could end up being really annoying and potentially even softlock you during the immovable block levels.
I think the game could be a lot more interesting if you added a base mechanic that would appear throughout all levels, for example, what if you could rotate the whole level and have blocks spread out for easier access, or the player themselves could rotate onto a wall and drop blocks horizontally and vertically!
I think this is a fun game to play in windowed mode while watching something else, but is in desperate need for unique mechanics.