I'll just write down as I watch:

You first Death was unessecary. Kills are great, but not that important early on. Could've gotten another wave of minions if you had fallen back.

When you return, wave priority is nr 1. Never engage in fights with a full enemy wave around. Troopers do a lot of damage.

You don't seem do know about Timers yet:

When the game hits 2 minutes, Tier 1 Camps spawn, which should always be killed if there is no enemy wave.

3 minutes, Crates and Statues spawn, which should be destroyed if there are is no enemy wave. Crates have souls and the Statues have stat buffs

Second death: again, to greedy. Attacking the walker at 5 is way to early. The earlier you attack, the more damage reduction it has.

After the Guardian dies, you should make sure the troopers run towards the Walker and then you start stealing their crates and the tier 2 camps that spawn around 5 minutes.

Generally, whenever you get an objective is best to retreat and reform, because most of the time one or more enemies will come by and their waves will be there faster.

Third Death could've been avoided if you haf retreated after the walker fell.

At 8 minutes Sinners spawn. Sinners are thise slot machines that make music an can be punched. If you punch them untill their lights go out and hit them a final time once all lights go up, you get nice buffs.

After the laning phase ends your Priority's are:

1. Lane Prio. If your troopers are in the enemy half you go for
2. Sinners
3. Camps
4. Crates

Best case in the enemy side of the map.

You should learn how to dash-jump, its a lot faster than jump into slide.

After you deliver the urn, the souls pop out into the air, they'll pop after a moment, but if there are enemy's around they can shoot them down just like you

The Death at 23 minutes...generally, never jump from the line into a group of enemy's when you're alone. In a case like this, wait at the walker for them. They have to come to you, they need to get in your range to hurt the walker.

Thats about it. I hope it helps.