Rouge Like
Basic Rouge-like, very user friendly. Point and click. No classes, but character gains specialization by what they choose to use and what armor they pick up. Can be multi-player.
Keep things simple, all hits count for "one", armor stops certain types of hits, not reduces damage. Like Hoplite (or Chrono Trigger) game is very geometric.
Not sure if I want a grid or not. If not a grid, probably click to move, with fairly slow movement (make players focus on strategy rather than timing).
This could also be turned into a space game. Warp gate to warp gate, slow ship progress