There is not unfortunately. We wanted to add a Codex that you can view on the title screen but we ran out of time. Most modules affect a single property. The icons should give you a hint as to what they do.
What icon?
Wait… I was supposed to find modules?!
I am missing out on a lot.
Where is all this stuff?!
I was supposed to kill the rocks!
Yeah killing a rock spawns modules, which you add power to with the buttons listed to the left of the module.