can you had like a stage reset button, because i accidently knocked a girl off the edge and now i cant purify, i cant progress the game anymore or add a jump while holding the girls
On PC, escape menu brings "Load from last checkpoint" option. On mobile, click on 3 lines located at top-left corner of the screen to get this option.
This is usually enough, but if you want to completely reset the stage in Demo, you can reset your save data from options menu. In full version you can restart a stage from 'Stage Select' menu.