The differences Darkapth will have are all the improvements modern gamedev made upon the mechanics of ARPG, RTS and MOBA - shorter sessions, intensive decision-making gameplay, advanced player interaction, fast-paced encounters, various levels of customisation and character building.
Plotwise, Darkpath will force characters into a time loop, where world around them is constantly returned to the beginning of the siege when starting a new session. This will allow for more interesting time-traveling mechanics to be implemented in both plot and gameplay.