This is a known bug. Sorry you had to experience it! Essentially there are parts of the character physics that are tied to frame rate (and somehow in an attempt to avoid this, I may have made it worse). I would not encourage anyone to play the game if they do not meet the requirements, even despite the physics issues. You are welcome to request a refund. I will be working towards fixing this but it won't be fixed during the beta sadly.
Thank you for the information. I don't need a refund, I am saving for a better graphics card though so sometime in the future I will be able to properly play, thank you for the offer though. Anemoiapolis is the perfect game I wanted to play almost as soon as I discovered liminal spaces. I especially love the water level / liminal space pictures you put up on twitter. I can't wait to see what the final version has to offer!