Hey Ajifsk,
I’ve prepared a fix for the iPhone mouseover/mouseclick event issue: please download this archive, unzip it, and upload the resulting files into the theme folder (/wp-content/themes/Ikebana/) via ftp, replacing the existing files when prompted. After that you can refresh the website on your iPhone and test if the mouse events are working properly now. Please let me know if it helps!
Regarding the greyscale tiles: I’ve modified the code, you can get it here. This one will make images greyscale by default and coloured on mouse hover.
Sincerely,
Andrii / Satori Studio