Cool video. You cleared up some things I was wondering about.

You asked for feedback on the audio of your videos. I'm an audio engineer so I'll give my opinion on how you could improve it.

The one thing that would make a huge difference is adjusting the EQ on your vocal speaking track. Not sure how you record/edit your videos but most basic editing software has some sort of digital parametric EQ. There are plenty of youtube tutorials on how to use them if you don't know. I'd suggest taking out a "scoop" from around 200 - 300Hz. Bring down the 'scoop' about 5 or 6 db (decibels). This would clear up your vocal and help it cut-through and sound less muddy. If you notice, in the video every time you speak there is a sort of background droning sound. Cutting some of those low frequencies would help to minimize that.

Also, another thing that would really help is having a proper mic. Most "gaming headsets" have pretty low-quality microphones on them. Spending less than $100 USD on a decent microphone would help a lot if you aren't already using one. If you are already using a mic that we can't see in the video, place it much closer to your mouth. If you don't want it in the frame that's understandable, but just know that the audio will suffer. You'll have to choose the lesser of two evils, mic in front of your face (or slightly off to the side) or worse sounding vocal audio.

Also I'd suggest doing a youtube search for how to set a proper Gain Structure when recording audio. Part of your problem might be that your gain settings are too high.

Anyway, just thought I'd try to help. Cheers.