Added a space theme and made a new map
Set background color to black
Player can specify a floor layer

It will be used by check_ground() to see what kind of tile the player is standing on.
Changed player's collider shape

Switched from circle to rectangle
Added settings for the space map
Floor layer? It thought I just checked that in
Config prepares to-from index range for tilesets
Removed a comment
Added callbacks for glass floor

Changed from pit to fall
Cleaned up a test, but keeping the code
Note to self: be consistent
Added a description of the player factory
Added support for collision groups in group manager
A whole lot of updating, cleaning and new features added to level loading