Goldenflame Dragon has made some changes to how targeting works in The Dark Unknown:

Refactored some targeting code, and added most of the necessary support for “Sticky Targeting”, which may be what players tend to expect in general- the target cursor staying on whatever you targeted last if you can still see it. Toggling this is now in the Options menu, along with two new options that I haven’t implemented yet- bumping into closed doors opens them, and bumping into monsters attacks them.

As always, you can – and should! – follow The Dark Unknown on Facebook for up-to-the-minute updates concerning the game’s  developmen.