With Parachute, it attempts fullscreen on launch, but still has the browser's URL and toolbar visible. Pressing the "aA" icon in the browser's toolbar allows you to hide the toolbar but it still shows a very narrow strip at the top with the URL.
After doing some reading this seems like a Safari limitation on iOS (at least on my iPhone 8, unsure about newer iPhones). See https://forum.unity.com/threads/fullscreen-webgl-mobile-on-ios.476006/

A solution mentioned in that thread is to save the website address by clicking safari's icon that looks like a square with arrow pointing upwards (share/options icon?) and choosing the "Add to homescreen" option.

Then launch your website from that new homescreen button. You need to make sure to then rotate your screen to landscape before pressing play to load the game. It seems if you don't rotate first before doing this, then the Safari toolbar is still shown onscreen.

Another bug on my phone is that the audio doesn't work with this game,  also when pressing the graphics detail button, the popup appears mostly offscreen at the bottom and to the left side of the screen so I cant change detail or background image, I can just make out the word "detail" and the top of the menu box (cant see the menu at all if the Safari toolbar is onscreen.

Regarding Popeye, same issues with no sound, I can see the fullscreen expand icon but it doesn't seem to do anything (app is already semi fullscreen I guess but with the safari toolbar showing). Same issue as above when clicking graphics setting button, cant see menu at all.

Additionally, even if I use the "Add to homescreen" method for Popeye, I cant get it to launch in true fullscreen as the safari menu is still there.

Popeye screen info size says 375x667 iPhone.

I tried parachute on my Android tablet and it works well in fullscreen with sound but I first needed to get it to load the mobile site version as it defaulted to desktop page loading.

Some other suggestions:

Hide the game's menu away when playing, or have it accessible so that it pops up by pressing a single ghosted icon.

When clicking the zoom button, perhaps have an option to "fill screen", "fill height" or "fill width". Or automatically check to see if a particular game is wider than it is tall, if it is wider then expand the game to fit screen width. If the game is taller than it is wide (donkey kong dual screen for instance), make the game fill the vertical space instead.

It could also be good to be able to play in portrait mode for games that are taller than they are wide, it seems to currently automatically switch to landscape mode even if I launched the app in portrait orientation.

This build is getting so close to reality on my Galaxy S7 that it's almost tricking my brain into thinking I'm playing the real deal. The haptics really add to the experience and ability to resize and lock is great.

I would recommend adjusting the transparency on the pause/play button when playing so that it's barely visible as that's about the only thing that takes me away from the simulation a little. It might even be worth adding a settings option to hide it completely, but still make the top left corner clickable to reveal the menu, once people know where the button is hiding it they should be able to remember where the menu activation area is. Not sure if others would agree?

I also wonder if any of these two button games originally had an auto key repeat if you held the button down? I notice that you do mimic key repeat on games with a DPad.

Can't wait to relive the Octopus experience on my Android phone. Thanks again for all your efforts, you have some amazing skills.

There are two things which will add even more realism. (not sure if I mentioned one of these previously)

1) I notice that when rotating the viewpoint of the game around with my finger that you have a light source and this reflects off the surface at different angles depending on the view, it certainly adds a lot of realism.

What if you were able to access the gyro sensor of the phone/tablet in play mode so that adjusting the physical tilt of the phone affected the lightsource direction and hence gave you some simulated changes in lighting as you tilt your phone up/down/left/right. The full screen view would still be locked into place but just the illumination would change and trick your brain into seeing a bit more 3D depth.

2) I've seen some apps on phones such a labyrinth, pinball etc. which fill the screen but adjust the view angle in realtime depending on the tilt detection of the gyro sensor. If you look carefully at the following video you will see what I mean, notice how the viewpoint changes very slightly when they tilt the phone. So when you tilt the phone to the right you would see slightly more of the right side of the buttons for instance. Tilting the phone upwards would allow you to see slightly more of the top edge of the buttons. Perhaps getting a bit complex but something to consider for maximum realism (with ability to turn the feature off). For example, see