that will help new players a lot. mario does the same thing. it opens with easy levels, and then gradually shows you harder things that you will need to master to make it through harder levels.
i think that you could easily have a 50+ level game here with all the different mechanics you could come up with for challenging the player.
like i said before, work on a bunch of easy levels because it may give you clues or inspiration for how to create harder more creative ones.
and don't worry about how many people reply about your game. many people here are doing exactly what you are doing, working on something interesting. not all of us have the time, energy or will to multitask our efforts outside our own projects. it's nothing personal. if you keep at it, and keep improving your game. you will bring more attention to yourself, based on the merit of your creative effort.
keep at it...