Love the idea behind this! The throttle is very clever. Enjoyed the way 'looking' works, and use of the shadow. For me, the speed/gravity/wind/friction balance seemed just a little too sluggish overall. I like that it's not too arcady--it's a hotair baloon, not a lunar lander--but making a second attempt at spot-landing on any one particular spot felt like it took ages to 'reset' via going high enough for the west-moving wind to push you back far enough. Basically, I found the premise very compelling, and played it a lot longer than I expected, but felt like a lot of the experience was waiting. Does that make sense? I like the delay between throttle and movement from the ground, due to the baloon inflating first.
I got the magnet, but never managed to do anything with it (other than generate a hum). Droppable sandbags for a sudden course-correction/acceleration boost could be interesting (especially if dropping them on things had consequences).
Hope you keep at it, the premise feels fresh and I think there's loads of potential here!