Very well put together for a first game! There's not a whole lot of Graphic or sounds, but what's there is very well done and comes together as a very nice package. And this might just be me but I think I would enjoy the game more if there's not a timed aspect to it. It's a bit jarring to me that we have this nice chilled background music paired with a timer that is ticking away making me panic while sliding my puzzles. (but I totally get it that you are probably just trying to work in the Move it wild card)
Also this is not a huge deal, but thought I mention it. On my third restart, the game starts to do something weird to the first puzzle, merging all three tiles into one tile and making it not possible to continue unless I reload the game.