The downloadable Powerpoint version generally loads slides faster and is less prone to issues, but you need to have Microsoft Powerpoint installed in order to get it to work. Google Slides can take a while to load depending on your computer's hardware, but you don't have to wait for the download time and don't need any additional software.
February 3rd 2024 - Released Version 1.1 of Butterfly Effect for Powerpoint in order to fix to some buttons that weren't working in the downloadable copy (being unable to return to Red Flowers from Windmills if you had an effect equipped and the "return to nexus" button in Dead End not working at all) and clarify startup instructions on first slide. Also fixed a few grammar errors on the website.
March 17th 2023 - Released Version 1.0 of Butterfly Effect on Google Slides and Powerpoint