I think the game needs to present the objective to the player somehow. I was really lost when I tried the game, tried a few things and then just got frustrated. After watching the walkthrough video, I'm guessing not many people will find even the goal for the first level and then all of the work you did for the rest of the game is for nothing.
Also if you want clearer texts (like the ones floating) in unity, be sure to increase the font size, not the scale of the object.
Hope you have the time to test, rate and give me feedback too!