Ahh, I see the invite for the server keeps changing, I updated the invite codes but I'll try to keep the one on the main page up to date.
I thought I Fixed that bug but after checking again I found what the problem was. I'll upload the newest version here pretty soon.
You can disable the on-screen controls by tapping the icon in the top left. If it's causing problems then let me know and I can upload a separate version that disables it entirely.