Love the art style, it took me about a minute to figure the mechanic out but when i did it felt great though a bit counter intuitive (letting go midway seemed to give the most upward momentum where i'd expect that to happen at the very top). Maybe some more variety in enemies and obstacles /challenges. At the end i was able to rush the level pretty quickly and enemies didn't really pose a threat (i always kill them it seems). Very solid, awesome work.