I myself think timestamps of each showcase would be incredibly helpful

I think that the automatic show should work wihout you seeing it, an audio saying things about the game, even if it sounds like Siri or Glados (Wait, the Glados voice is a good Idea) would help a lot.
Also, taking a look to the automatic show i see a problem, is not very clear, you can see the title of the game, the trailer, music, and gameplay, but if you don´t know tha game you wont know what the game is about (Shooter, rpg, etc.)
I think that its a little Saturated, Some music and a voice saying "This game is (rpg, shootes) developed by (Studio) published by (Publisher) and Its Characteristics (Multiplayer, Co-op, Single player) and specs (About how much you have to push that potato with motitor you call computer to run that game) will be enough

I'd say try to keep it brief and sweet, try to cover most of each genres, and try to include some niche and upcoming titles.
It seems to have done well in that regard so far.

I'm sort of curious what it was like with the more robotic voice.
If that isn't going to be an option in the near future, for example the voiceover is unfinished but the scripts are tangible, then it may be worth while adding closed captions, because I'd like to see what the automation would generate.

maybe more additonal information about game (on the right side - reviews, developer and actual price (without DLC)

I like the concept, but there should be less cinematic footage and more focus on including raw gameplay footage. Also, the clips are a bit short for each game. I think it would be a bit more preferable to expand to 10-12 seconds instead of 6 per game. Good work though, keep it up guys

I think the voice over is a must, I don't really care if it sounds a bit stilted. Also more interesting motion graphics.

Subtitles, raw gameplay footage, timestamps of each game and maybe even a list of each game and timestamps (links to the certain time would also be helpful) in a caption for it or something

I think more time for each game (and in conclusion less games at all) would be better. Also with (linked) timestamps. The idea, that you can jump to the game page of the game, which is shown at the moment is really good.

To be honest, I'm not sure if this would work out on a regular basis. A lot of people might already consume other sources to keep themselves updated (including reviews to each game).
I think this would work perfectly as a overview/preview for specials, as steam summer sales or publisher events, but not as a regular store update.

Timestamps for genres/topics, and possibly a list of the games shown.

Whilst a games footage plays and the user has their mouse cursor over the video have it display a simplified / brief overview of the steam page and its general stats (price,average rating,ect)

Being able to skip between games, either back or forth, in order to skip a game you don't like or go back to a game you do.

Watched the video at full screen.

I didnt like the quad view, made me feel sick.
For games like "my friend pedro" it had a perfect trailer for quad viewing,
but for "totally reliable delivery service" and "sekiro" the quad view was uncomftarble because "totaly reliable" had a quad view in their own trailer and "sekiro" had a lot of text. Games like light novel and rpg games were litteraly ruined because the plot was sliced into 4 pieces at unknown spots

Quad view is good for showing multiple actions/features but if consistancy of the video is importand then it ruines the trailer completly

Letting the trailer uploaders define what spots of their trailer may be shown in random order may help in reducing my problem

This was the biggest problem for me

The automatic show need timestamps (as others have said) and should not be longer than 7 minutes. 6 seconds per game is too little maybe 15 seconds would work. The quad view is too much as I don't know where to focus. If a game is in pre-order or early access then it should show. Voice over would be nice as well.

the length of the clips is to short and there is no way in full screen to jump to the store page
so a feature to be able to click on the video and pause the playback and jump to store page for that game then resume when focus is back or a way to quickly mark a game for closer review later if something catches your intrest