Good game! I too liked the floatiness of the character and responsiveness feels good; I love the graphics! they give me vibes of being on Mars-like planet :)
One little change i'd say is to give a visual indication of when 'float' starts, you could have the character as 'deflated' (perhaps animation exaggeration concept) when jumping up and then 'inflate' (what it looks like right now) it when falling down
Also, footstep sound is tad too sharp for my taste :)