Hey, so first of all I'd like to say thanks for playing! I appreciate that a lot. I have been releasing patches every day to fix as much as I can :) but alas it is a jam game and was made in a short period of time by one person and it takes time to fix these bugs.
However, since that build you played I released a new patch that fixed a lot and added checkpoints, there are some changelogs for each patch on the itch page that can inform you on the things getting fixed.
On top of that I plan on releasing a new one today that fixes the end encounters! A big optimisation patch will be released at the end of the week too.
Hope that helps! Thanks again