A lot of players are having issues with attack buttons not being responsive.
It seems that the issue started to happen after update v0.9.6, the update delivered a new combat system, so the issue is now a little more visible to us.
Also, we would face some trouble fixing it since we didn't face it on our PC, or even experienced by the game beta testers.
We will try to fix the issue as soon as we can, meanwhile we apologize for the Inconvenience.