Maybe I am the only one, but that little "tk" at the end of choosing sound in menu is so annoying, I know one could just ignore, but the more you try doing so, the more you start hearing it...
P.s. Encountered a bug: placed a wire trap on the second middle red field and used Knight's skill that pushes 1 enemy back (red arrow with three dark red dots), then I couldn't do anything, it just froze in that state, opening and closing the map didn't help.