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When you distribute a small example script of Ren'Py, the size of the font file will be larger than your script's one. However, your script will only use a part of glyphs in many cases, so you can strip unused glyphs to reduce the size.
This page describes how to strip unused glyphs in the font file using FontForge.
Test environment:
1. Download all scripts from the following place and extract it: Media:Strip_unused_glyphs.tar.gz
2. Set the executable path of FontForge to FONTFORGE variable in strip_unused.py.
3. Run the following commands in the unpacked directory:
$ python strip_unused.py [orig_font] [dest_font] [script_dir]
# orig_font ... original font file
# dest_font ... destination
# script_dir ... rpy file's directorystrip_unused.py takes character codes which are contained in rpy files and all codes from U+0000 to U+00FF and passes these codes to strip_glyphs.pe
strip_glyphs.pe is a script file of FontForge and it selects given codes, inverts selections, removes them and saves the new font file.
Then, the reduced font file is created to dest_font.
When you use the stripped font file, spaces of each lines may be decreased. In this case, please update style.default.line_spacing