The burner only lifts and the vent only sinks: hold
Space or ↑burn to rise,
↓vent to come down faster.
Each height has its own wind (the arrows at the side show them), so climb or sink into the one that
blows your way. Come down softly on the ringed field: near the flag and with propane to spare scores more.
Too hard a landing, or the river, ends the tour.