So on my first playthrough I used the grappling mechanic mostly to stop on the next platform after jumping. Thought it was a nice platformer game with fun physics, although not challenging.
But then I realized you could speedrun the whole game just by getting launched by the windmill! And after several tries, I eventually succeeded! This was so gratifying. Felt like finding a secret hidden in plain sight (in that case, the cover art itself).
Nice work on that minimalist but pretty fun experience!