Weapon designs

In our group we have come up with a strategic space board game for our task. I have been put in charge of weapon designs. I have come up with a good amount of concepts but of course not all of them can be finalized and it's important to keep a good balance with the weapons, less some become under or over powered.
Here are some of the weapons the group has liked:

BOMB: Simple enough, drop on a square and should someone land on it, BOOM, they take damage.

GRAPPLE: Interesting, if within a few spaces or so of another player, you can grapple them and fling yourself forward and/or drag them backwards. Works great if used with the BOMB.