Increase speed, drop down, and reverse direction!

A simple relationship grid showing the basic interaction between “objects” in Space Invaders, and a list of their properties and behaviours. A grid like this can be drawn many ways (and probably better than this). It is important to note that this exercise is done from a design perspective, rather than a programming perspective.
To avoid confusion, relationships should be read row to column only in the grid. Blank spaces denote no relevant relationship.