The forum looks good i tried it on mobile but only thing to fix is when you register it asks for password but its 2 blank white boxes and it took me time to figure it out.

:) ;) ?  This is a test

Samsung Galaxy S8 ( Resolution 1440 x 2960 pixels, 18.5:9 ratio (~570 ppi density) )

newthread.php - https://i.imgur.com/vdlFN7N.png (altering needed)
search.php - https://i.imgur.com/eLY83DO.png (altering needed)
search result - https://i.imgur.com/IOl6Bx2.png (altering needed)
compose private message - https://i.imgur.com/jsDItW5.png (altering needed)
browse forum - https://i.imgur.com/FjUh84g.png (looks perfect)
member list - https://i.imgur.com/XtOUzGO.png (altering needed)
buddy list (UCP) - https://i.imgur.com/ApiJtej.png (altering needed)
new private message - https://i.imgur.com/9ibeby4.png (looks perfect)
reading new PM - https://i.imgur.com/EE1kNhU.png - (looks perfect)
quick reply PM - https://i.imgur.com/EE1kNhU.png (the text and buttons could be after each other instead of on-top)
wrong password - https://i.imgur.com/T96pcBR.png (altering needed)
tabs - https://i.imgur.com/S0AX7BH.png (looks perfect)
login - https://i.imgur.com/SSK7zM3.png (looks perfect)
registration agreement - https://i.imgur.com/A3Qf3ih.png (looks perfect)
registration details - https://i.imgur.com/Z3PP3h1.png (altering needed)
polls text - https://i.imgur.com/8kogk6C.png (altering needed)
contact us - https://i.imgur.com/1sfjZwT.png (altering needed)
view thread - https://i.imgur.com/aeB5wy2.png (looks perfect + works great with large images)
view profile - https://i.imgur.com/Nbz8sh1.png (looks perfect)
no permission - https://i.imgur.com/Xb4kVwl.png (looks perfect)

Desktop (1920 x 1080 px)

I find the desktop version to be flawless.

-

Tabs, drop-down menu, member.php, design, more - well done.. 
When plugins are added i'll make sure to test them.

Something for the mobile; if you look here. There's a bit of space on the sides, maybe try to make it less empty space on the sides?
Not sure if it was done on purpose for good reasons or just hasn't been altered. 

Good luck. HF will definitely be the first large forum to have a PROPER mobile friendly theme.

No body needed.

Ok  :angel: :angel: :angel: :angel: :angel: :angel: :angel: :angel: :angel:

user cp
Quite a few things are non mobile friendly in the 
https://imgur.com/a/9idg7

Hitting username dropdown
While on mobile after selecting your username for more options and selecting Open Buddy List the buddy list pops up and the menu stays active and covers it up ? https://imgur.com/vjWXWty

:angel:

Maybe its just me but oh well not a big deal
This is what registration looks like from lg g5
https://imgur.com/dQXOrHC


Not able to see left part of new thread page theres no way to pick emojis for example and only half of the preview button shows and from the preview page i can add emojis and see the rest of the page
 


https://imgur.com/iAPJhCg

Looking good so far.
Typing this from iPhone 7.

As others have said some of the pages look funny.
However I know this is Work in progress.

The most important thing is that google sees us better and the ranking is better.
We can always make little tweeks latter 
For the looks and feel.