I tried going back and forth on this exact idea, but my brain somehow kept messing up portions of it still. I started smashing left + up, instead of down + up

I tried going back and forth on this exact idea, but my brain somehow kept messing up portions of it still. I started smashing left + up, instead of down + up when they came together. Eventually I got through it with 89, but not sure how many turns and I don't remember the configuration, but something finally clicked.