This is a top-down turn-based shooter. This works because of a momentum mechanic that forces players to think a couple of moves ahead.
Mechanics:
Primarily point-and-click based (though keyboard is needed)
Turn based
Free-for-all, PvP or PvE
Players are shot when one moves to the same row or column
Players have momentum in the last moved direction
River which removes momentum, adding complexity
Obstacles cannot be moved or shot through
Randomly generated map of chosen size, characters placed on map by player
Bots can be placed alongside players, allowing singleplayer gameplay
8-bit (square wave) sounds
Completely local, ie multiplayer is local, occuring in one instance on one machine
Additional features
Option for instant respawn (rather than new round)
Option for hiding map behind obstacles (continuous or discrete, using tiles)
Option for "toroidal mode", allowing crossing of the edge of the map and appearing on opposite edge
Option for removing river
