Thank you for playing my game and leaving a feedback, Jordan!
Duly noted, I have added more instructions on the game's page and in a potential future build (depending if I will actually do it) I should update it with better hint system.
There isn't an instruction screen because I thought it would make the prelude 'Reunite' ending easier to miss which would mess up the order of story reveal - as players are inclined to press any buttons they are aware of and forget they can also omit pressing it altogether. Technically the first ending was also to function as the reveal of the mindreading ability, but I should have made it clearer that the lily is a button. Unfortunately the instructions suffered due to the VN being rushed for publishing before the jam deadline.