Thanks for playing! Haha, it seems most people try and shake the mouse at first before the shake prompt comes up :P
I also agree with your suggestion. It was actually planned to have an extra checkpoint after each initial light lock, but I was struggling to get it to work while checking if you went to the left or the right path first (code and trigger order were getting messy). At that time the final part of the game wasn't even started so I put the checkpoint issue on hold until the rest of the game was finished. However, once I got everything else finished the gamejam was almost over and I didn't have time to go back and properly implement it, so I left it with the one checkpoint at the start of the light lock room and hoped it wouldn't be too annoying since one of the paths is rather short.
I may make a post-jam version of Borb as a download option in the future with some other minor fixes/additions, and if I do then the extra checkpoint system will definitely be added :)