Ok so here is my review
Your channel banner is ok it says exactly what you do on the tin I.e it outlines your channel name and tells us how you play the games, however you do have a lot of dead space in the banner, which isn't necessarily a bad thing I think you could just tweak it a bit, maybe include something to fill those empty black spaces to the left and right of the logo. Also speaking about the smaller YT icon you might want to try resizing it as it comes across very squished and illegible. (A small thing I know but wanted to mention about it)
Moving on its very nice to see that you have videos organised in playlists and have taken the time to write something in the about section of your channel, again its also nice to see you have linked your other accounts (twitter patreon and Facebook) here as well.
Now the next part may sound a bit harsh and please don't think i mean it to come off that why but your channel trailer didn't grab me, instead you came off sounding a bit robotic which didn't really entice me to watch your videos if i had just stumbled across your channel. If you have the chance, and i know this may sound dumb but maybe reuploading it, with a script / outline of what you want to say while smiling may help. I offer that as a suggestion as people can normally tell when your enjoying a game or anything for that matter from your voice and from watching it at this minute it seems a bit like you didn't really know what to say, or if indeed you were saying too much.
Though saying that on your videos such as your Doorways series, when you do speak is always very clearly and I can't fault your audio. What I especially like is that you don't try and talk all throughout the video which some "lets play" gamers tend to do. Another thing you might want to consider going forward is creating some kind of intro to your videos, there isn't anything wrong with jumping straight into them but maybe to help with your brand recognition it won't hurt to have a quick intro just to ease into the video.
Lastly (just realised how long this is, sorry about that) is your thumbnails. My only suggestion to those is try and be consistent, as some like the Doorways and Bastion seem very simplistic (in a good way) and really stand out while others for example your Unreal Tournament or to some extent CS:GO seem a bit cluttered and messy. Its sometimes very difficult getting that thin line for them and I know it can be difficult creating something that "pops" everytime.
Anyway I shall end it there as I think I've wrote enough for now. Hope it helps
