Hmm, some versions of RenPy I get freezes for 20seconds or so after several lines of dialogue.
EDIT: The freeze could be triggered by manually resizing the window. Running in Fullscreen mode doesn't produce the freeze (yet)
Temped to get the latest build 0.6.3 BUT there may be some serious bugs still so might be best to see if their fixed in 0.6.4, so I'll hold off until then.
It seems like a interest game and has potential but needs a better vault exploration system; and it be a lot better with some voice acting as it looks like a game with some good comedic relief which is always better with VA.
(I have been using speech dispatcher and pied to get decent quality VA but it doesn't do emotion well and can read parts of screen not wanted such as REP bar, yes you need to do TINY edit to tts.py to change it from terrible espeak voices)