I play mostly on a Nexus 7 tablet or an iPad,
The problems I am experiencing are
1. The game is constantly pausing itself to 'refocus', I mean over and over. I set that to No in the Project properties but it is obviously being overridden.
2. I use drag and drop a lot and sometime the screen moves all over the place when touched,
this problem is especially bad on the slide bar when the player doesn't touch the tiny slidebar 'thingy',
the entire screen moves with the finger.
( and when I press full screen and nothing happens)
3. A few days ago, I had a problem uploading a game with SprintFonts (even when using https:) it loaded but only a white or black screen appeared. Ended up changing the entire game to regular sprites and it works.
< EDIT > this next part solved - kind of
4. Not only the Arcade but iPad and iPhones have a serious problem with sounds on browser games. I can preload sounds on an Android but when I try to load the exact same game on an iPad it either never loads or maybe after an eternity it finally plays. Is this a C2 issue or an iOS issue? I remember a while back loading a game I made with GameMaker ( and lots of sound files) into HTML5 and I don't recall an issue.