Looks good mang!! Try to sit back a little more, you looked a little close to the tree to me. Also a Daniel said above get a better position before you cut. Like the limb with the balancer sling, you could have been on the side it didn't swing towards, instead of being behind the trunk a reaching around. Try to mix up climbing with and without spikes. When I was learning to climb, I landed a job nice job deadwooding and crown thinning 4 big honey locusts. They were way out of my league when I started, but Those 4 trees made me a much better climber.
Stay safe. Its a fun job!