Hmm, those are helpful information, thanks for telling me :D
I got another speculation and that's maybe your pressing action is treated as dragging action, which might results in it reacting, but not doing anything.
I'll try to increase the deadzone between pressing and dragging on the next update and see if the problem is fixed.
Also, have you tried playing in a different browser? I used chrome to play-test the game and it works fine for the moment, both in normal and desktop mode.