OS - Android 4.4
Device - Samsung Galaxy Tab 3
So I tried the test today on a Samsung Galaxy Tablet but I could not input anything into the home screen. As proof of what is going on, I have recorded a quick video. As a fix to this, for mobile devices make the boxes MUCH bigger and scalable with the screen resolution.
In the one time I did successfully log in, everything I types was in block capitals (other people reported this in-game) but the app soon crashed and I was back on the login screen.