That's a very promising concept for a game! I would add a title screen, level selection (maybe even a level designer?) perhaps collectables in some levels that would unlock extra levels and also, please, add some good music! (There are plenty of good musicians here me included *wink* )
The graphics are good, but maybe after a few levels you could spice up the background or just change colours after a batch of levels to add a felling of progression to the player.
Also if you were to write some narrative (even a silly one) it would help with the felling of progression adding a new commentary each level. (I recomend you to NOT choose a "save the princess" type of motive and more a "I'm trapped and need to survive this" or "My master ordered me to do this" kind of motive because that's align better with the gameplay in my opinion - Maybe you are a disciplin of a entropy wizard that ordered you to destroy all solid matter in the world - Or an evil scientist has trapped you and you must survive while he/she monologues)
Just throwing Ideais, your game has inspired me.