Direct answer: a round of Oneshot Fishing is aim, wait, fire, settle. Unlike spray-and-pray shooters, this room is built around the single shot - the cannon loads one shell at a time, and the payout lands on whichever creature that one shell finishes.
The full loop reads in five beats. One, set the cannon power - each level raises both hit strength and per-shot price, so the level is the budget dial. Two, read the swimming field and pick a creature whose multiplier justifies the shell. Three, wait for the crossing line where your shot connects cleanly. Four, fire once. Five, settle instantly and decide again - or bank, because the room never forces the next shot.
That waiting beat is the whole character of the Okplay APK Oneshot Fishing table: the pause between shots is where disciplined gunners earn their edge, not on the trigger. New players should run the Oneshot Fishing Demo first - same cannon, same pricing, practice credits - until the waiting feels natural instead of slow.