A well executed take on the "connected characters" idea. I thought that you explored a few different ways of using the spring well, like building up energy in the spring and using it to swing. The checkpoint system was frustrating; perhaps it should have saved the last position where both were fixed and used that, with "R" used to reset the current section if a mistake is made? I also think using "S" as the button to affix the slimes instead of Shift would have made it easier. Otherwise a great entry!