I'll see if I can access the phone's vibrate feature to add some haptic feedback.
I've updated the parachute build with a potential fix for the iOS audio issue. Let me know if works on your iPhone.
Viewing post in Touch screen support
There does seem to be some advance with the iOS sound issue, sounds now play for a short while albeit a bit distorted but then it goes quiet again shortly after, gameplay also seems to be a lot less responsive with newer version in iPhone 8.
I did find an easier way to get fullscreen on my iPhone without needing to add your website to my homescreen. Load the game's page in portrait mode but before pressing the play button to load the actual game, scroll up slightly on the page and the toolbar should hide, then press play and game will load into full screen mode with no URL or toolbar.
I also tested on a 7th gen iPad and it seems to go to fullscreen in safari but has similar issues with audio after a little while of play, it also has same issue with regards to game graphics popup menu being mostly offscreen and impossible to reach the buttons to change those settings.
Android seems to be the best way to play so far.
Thanks for your efforts... it's all very impressive even if there are iOS issues.