Episode 4:
in-game days 5 and 6
656 renders
10 animations
16500 words
17 new music tracks
9 new Steam achievements
added the ability to name save files (can be turned on/off in the preferences screen)
fixed some typos in the previous episodes.

Episode 3 Part 2:
603 renders
4 animations
11 new music tracks
14,000 words

Episode 3 Part 1:
462 renders
13900 words
added 2 new music tracks
new main menu background video
vastly improved writing in Episode 1 (not a reason for a new playthrough, but should be a huge improvement for new players)

Episode 2 Part 2:
338 renders
14192 words
added 7 new music tracks
made all of the music tracks in Episode 1 fade in and out more smoothly
remade 1 render in Episode 1 that I was particularly unhappy with
corrected typos in Episode 1 and Episode 2 Part 1.

Episode 2 Part 1:
over 11 thousand words
230 renders
approximately 45 minutes of playtime
Episode 1:
over 34 thousand words
473 renders
22 music tracks
approximately over 2 hours of playtime