The two endings you got seem to be the "bad" endings which you can't continue from in the full game.
To get on a patient's route (one of the four) you will need to spend one session a day with them. Just make sure to spend at least one session (tuesday to friday, monday is scripted to get to everyone) with everyone else, or you'll be accused of neglecting your patients and fired. Additionally, you'll need to get most answers during their sessions right.
To get on Sharpe's route, do your best during the job interview and spend an equal amount of sessions with everyone. And for Elizabeth, you just need to hang out with her every day since tuesday and try not to say something that will upset her.
To put it simply: you can't proceed without selecting a route, and there's no menu to do that - you need to get on a route throughout week 1.
I hope you have fun exploring the different paths you can take in the demo. Thank you for your kind words ~