Great lil game! Nice to have multiple endings and the secret ending was a nice little surprise. The colour change at the beginning was a cool touch to let the player know something has changed after completing all 3 endings. Feels like a well put together passion project in a creepy retro style.
Something I would like to see would be some more story or reasonings for the different endings,  a different ending for each dialogue option and finally a cinematic scene for the secret ending would be really cool.  But overall I had a great time playing this, will recommend it to friends, and look forward to seeing what else you make!