**** Spoilers *****
What you're trying to do is "free" the skeleton from the room, right...? So, unlocking the bike chain is the start. The next thing you need to do is get certain items and place them near the jar that you can use to burn the incense in. The combination of the incense, a few items, and ringing that little bell will "free" the skeleton, and you will see the end sequence. Don't forget to look closely at that blanket once you pick it up, as there is something crucial there. Also, you need six of those chinese character cards to complete the game.