We've just pushed an update with a slight alteration to the controls so they are a bit more comfortable for people accustomed to VNs made with Ren'py.
"S" key --> Now takes a screenshot of the game that gets placed in your local save directory
"Ctrl" key --> Now skips through text (read or unread)
"Space bar" will no longer select a choice; press Enter to do that instead
The log feature previously mapped to "L" has been removed; this was never meant to be a supported feature. You can use the mouse wheel to rollback through text in the game, back to the latest choice point (you can't redo choices, which is a significant but intentional change from Ren'py).