I've been refining weapons rules ideas for "Blue Max in Space" - a space combat game on cubical grid. I've decided on a general principle that you can only shoot in the six axis directions. Therefore, the "missile" rules have changed to be more ... Vietnam era Sidewinder/Sparrow-ish.
So, the basic weapon styles are:
1) Direct fire
- can shoot at a target lined up in front of the firing port (range 0 shots aren't allowed)
- prox fuse explodes when something enters its cube
- like a mine, but it moves forward; it explodes if it enters an occupied cube
- has two modes of operation:
4a) Inertial mode
- like a torp, but if something enters a cube in front of it, the torp locks onto it. If a missile has multiple targets in front of it, the player chooses which one to lock onto.
4b) Locked mode
- only explodes if it's in the same cube as its target. When it moves, it can maneuver like a spacecraft. However, the player must chose a move which minimizes taxicab distance to its target. If the target is destroyed, the missile immediately reverts to Inertial mode.
Ideally, you'll want to launch a missile in Locked mode, which means maneuvering to get your desired target directly in front of the firing port. This invokes the feeling of Sparrow boresight mode for initial launch, although the missile can then seek the target on its own after launch.
Alternatively, you can just sling a missile vaguely toward the enemy and hope that it locks afterward at some point. This invokes the feeling of launching a Sidewinder without tone. Friendly fire can be a risk, though, since a missile in Torp mode will lock onto anything that enters its line of sight.
These missile restrictions are weird, but I think they make for more interesting gameplay than simply being able to launch missiles at targets in any direction while other weapons require obtuse maneuvering to line up a shot.
Fundamentally, the game is about maneuvering and restricting enemy maneuvers. It's not so much about range control as it is about lining things up along axis directions.
BTW, I'm still not sure about a good game title. I kind of like "The Speed of Warp", but I don't think many people would have ever heard of "The Speed of Heat". So ... ???