First of all allow me to apologise for the delay in responses. This has been one hell of a week. Let's get started!
@Razz_
Yes, keep the end card at around 10 seconds. Short enough that it doesn't drag on but long enough for people to click on the links if they'd like.
@Diego Villarreal
Sweet, a magician! First things first, audio mixing is all over the place. In some of your videos, you have a lavalier/lapel microphone but it's completely blown out/peaking. You need to make sure the mic gain is set low enough that it doesn't peak (go in the red) but loud enough to pick up your voice. You can always increase your volume in post to the appropriate levels.
I suggest investing in a field recorder like a Zoom h4n or H6. You already have a camera man (recording on an iPhone?) so hooking him up with a field recorder shouldn't be too big a deal. You'd need to sync it up in post but with a field recorder, you're able to plug in an external shotgun mic with a windsock/dead cat to knock out the windy sound your current mic setup is picking up.
Your branding needs a lot of work. You've kept the 'Diego Villarreal' text consistent across all your videos but it's not reflected at all in your channel header, avatar or thumbnails. I like the black face of the deck of cards you own (also shown in your channel header). At the moment I take it that's your 'signature'? If so, try to incorporate that more as your unique brand, perhaps having the face of the card acting as a background for your thumbnail text.
@Lia
Love the simplicity of your logo in your channel header and avatar. Absolutely fantastic. Try to include that logo in one of the corners of your thumbnails so viewers know the videos belong to you.
In your Outlast series with the facecam, your audio quality is substantially lower than that of your Minecraft and Call of Duty videos. It's as if you're not using your good quality microphone and simply relying on the built in microphone on the webcam.
Overall though, your voice is clear and easy to understand and the videos themselves are very well edited. Branching out into different games is great, as the more variety you have on your channel the more your audience has to watch and be entertained. Make sure to keep a frequent upload schedule and your channel will grow.
Great job!
@Poly Gamey
The way your channel homepage works at the moment is counter productive to your audience getting to your videos. There is no way to click on the 'Videos' top bar menu item like in other channels so users need to click on 'Uploads' just to isolate your own content. There is an option in your YouTube or channel settings to set up a decent homepage that is much easier to navigate.
Your logo is simple but effective, yet it's only being used in your avatar. Your channel header and thumbnails are not reflective of that logo or your channel/branding as a whole. When users see your logo they should instantly assosiate that with 'Poly Gamey,' so incorporating it into your thumbnails will help with that.
By far the biggest issue with your content at the moment is your microphone. The quality is absolutely terrible for a commentary channel like yours. Save up and invest in a decent condenser microphone. You may also want to consider using royalty free music as a backing track to your videos to liven them up a bit.
As for your video presentation, that too needs a lot of work. Some of the sprites you're using are lazily cut out with white borders/artifacting still present. Having them and the content animated at 1-2 frames per second doesn't help either. Having a slideshow on YouTube with a commentary track laid over it can work, provided the slides are interesting to look at for your viewers. Perhaps you could commission an artist to help you create a signature look for your videos and to help create slides that compliment your audio track while being visually impressive to look at.