I see nothing wrong with that grid, well done.

apart from diagnosable being spelt incorrectly.

"Diagnosed" is an acceptable entry instead of diagnosable in that link.

8 legs wasn’t accepted , 1 star for that alone

8 legs was not accepted ... you expect people to write war and peace like you did, very poor

Computer games was not accepted.

Computer games not accepted. Creatures with 8 legs not accepted, but a good grid.

The four things that are wrong with the grid which some people have noticed three between them:-
1) These are computer games (specifically card games) but spider can have more than one variant.
2) Octopi does not have tentacles, they are known as limbs which are mistaken for tentacles.
3) Scorpion is also a card game and Spider is an eight-legged animal so the wall has two possible solutions.
4) A spelling error makes this connection incomplete.

I admit now there are things slightly wrong with that. Agree with Scorpion bit.