If you are able to describe the checkpoint(s) you had a problem(s) with, do let me know btw! That would be very useful to write a note about on my end for later. I have a video on the game page you can use for a timestamp if needed :D
Also forgot to respond to the story part! I was considering adding a story to this, with a cutscene and some NPC in the map for this, but I ran out of time sadly :( It would be cool to flesh out the world with more dynamic stuff like that between the player and other characters though for sure!