Valve just nuked Silicon Echo and Zonitron

Laseronium: Over The Line still available on Tremorgames.

Not sure if and how many pre-existing assets it uses, but it looks bland.

Anyway, it looks like Silicon Echo was just another of Zonitron's many aliases. Some people even suspect that the Kickstarter funds for The Herbologist haven't been used for the game itself but to pay the publishing fees for many of the stuff they've churned out over the last months.

It looks like they're using the HE - Abandoned Garden v.1 environment scene from the Unity Asset Store.*

I have no idea how they're utilizing it. Maybe they'll make a fantastic game with it, but there are a lot of scammy shovelware games on Steam that just have you walking around these things with very little gameplay. I always have a laugh when reviews say, "Well, at least the graphics are good. I'll give it that."

*Unity is a great engine. Assets are a great way to help developers.

Silichon Echo is the same as Zonitron. It is one person who made a bunch of company names on Steam:

• Zonitron Productions
• Crimson Duck Studios
• Silicon Echo
• Digital Airony
• Cubecumber Games
• GooCubelets Games
• Sword Bubble Games
• Pixberry Studios
• AntEater Games (not the same as Anteater Games)
• Zonitron Studios
• Digital Carrot Productions
• Netfork Studios
• Floop Productions
• Broadplay Games
• Digital Airony Studios

And I doubt he will be back on Steam.

there are many ppl who will gladly take your cards

VanillaBot can help you turn those cards into badges.

1 : 1 Cross-set Trading Cards from non-Marketable Cards
I also able to trade my non-marketable cards for your non-marketable cards for free.
Non marketable cards means that cards can't be sold on market anymore (from removed games)

Alternatively you could gem them.

nothing useless about a card that can be turned into gems or badged :)

If you look at steam trades, some people take them.
There's also a thread or two that takes unmarketable cards for marketable ones.

As far as I understand they are not removed from your account (in fact, I've got some of them from mass key giveaways and I still have them), but from your public gamecount. This made me realize the two numbers are not connected - the number you see in your library while using the Steam Client won't be necessarily reflected in the one people can see in your public profile.

Yep, they all still work fine.

I think you have to add a new game (or f2p license) to your account, to update it.

That is simple. The basic premise of Greenlight was to let the community do the curation and Valve itself keeping out of the curation process nearly complete which was the correct decision as it avoids claims of favouritism or similar. Problem was the community did not do ist job but rather complained without doing anything. Because complaining and pushing away responsibility is always easier.

Now with Steam direct the responsibility is on the side of Valve again so they take a tiny bit more effort to clean up the mess.

You'll have to manually look and hide them yourself.
It's best to use the archive for this.