(Idea/Suggestion) Ricocheting Bullets
Just a simple idea; bullets could ricochet off of denser blocks (Heavy Armor, Blast Doors, etc) when they strike at certain angles. Lighter and more sensitive blocks (Light Armor, Jump Drives, etc) would still be affected normally.
As an example, angles of 10°-20° could cause bullets to bounce off of armor and potentially damage other blocks or grids. They could deliver either a percentage of the damage to the target they ricochet off of, or none at all. Of course, that's just a base thought.
This doesn't need to be anything fancy (e.g. curve calculations, reduced velocity, etc), as just seeing bullets ricochet off of targets would be a spectacular sight.