The game's really well-made! I love the almost 1-bit style graphics, kinda reminded of Downwell for a second. Graphics and sound go really well together and it plays really nice too! It took a bit of time to get how the gameplay works, but overall feeling was great! :)
Maybe, like other said, you could expand on gameplay and add more levels, as it starts to repeat itself a bit. It feels like a good endurance game if played that way tho. Maybe keep some basic level layouts and find a way to increase difficulty every loop? :P
Good job! ;)