Like was said here before: Botanicula and indeed all of Amanita Design games (Samorost, etc) are suitable.
Also, my personal recommendation is Lilly Looking Through . My 7 y.o. daughter keeps coming back to it again and again

On steam, I also had a success with Windowsill, The Tiny Bang Story, Morphopolis, Castle of Illusion (mickey mouse game), Brothers: A Tale of Two Sons, Papo and Yo and Rayman Origins/Legends

Since no one seems to have suggested it yet: Mousecraft. Some of the puzzles might be too difficult to get a perfect score in, but you don't need a perfect score to proceed. And the setting would definitely appeal to kids.

Why hasn't our new forum community leader banned you and your bots yet trash?

I was taught to read when I was 3. Haven't put down a book since then. (Unless when gaming.) Not into gardening though.

I normally don't agree with you, but this one I have agree particularly the part about obese, but more correctly, diabetes.

With that said, my 7yo niece only ever play sandbox games like Minecraft or Goat Simulator, which she is very good at. I think it's good, but she watches these YouTube Minecraft channels, so she's a pretty advanced meme regurgitater and swearer for her age. Parents are running their shop 12hrs a day so they could careless and let grandma does the raising, but really the iPad raises them.

In a way, Nintendo raised my ass. I don't think I was ever exposes to the same level of stimulant and had unlimited access to sugar supplies.

I think Terraria would be good as well, but the Corruption/Crimson biome may be a little frightening to a young child, I'm not sure. Also, some of the bosses.

Crimson biome music is depressing, indeed. :/

If he's ok with oldie graphics then Ducktales: Quest for gold is a good pick. I played it around that age.
Gobliiins series might be ok too, especially if he'd have someone to play together with so they could figure out the puzzly stuff together.

Racing-type games are easy to grasp, so perhaps some Wacky Wheels or Olliolli.
Some platformer like Earthworm Jim, Rayman, Rogue Legacy, Bastion, Shovel Knight, Jungle Book ...
Maybe an adventure game or two: Monkey Island, Day of the Tentacle, Toonstruck ...

Safe to say you'll probably going to need a whole bunch of games.

Lumino City has also proven to be a big hit with my boys.

So you're still learning to read?

+1 for never giving up, that's the Duke I love.

Wondering if Undertale would work?

(This is, again, assuming the child can read.)

Lesbian tranny you really know nothing about six year old children do you?

Mhm, not sure I'm really in touch with 6-7 year olds, but maybe Stacking might work? It's apparently free for all ages and I found it to be delightfully whimsical and quite endearing.

Plus, if you don't like the actual puzzles you can just run around and fart in people's faces, which I assume kids will like...

Undertale is probably a great kids' game even if they won't get the earthbound references