Thanks haha, there really should be more obstacles, but oh well, maybe I can add some new ones in a future update when the Jam is over. As for the final puzzle of rewinding time to get out of the hole where you got the key, I'm glad that several people liked it. When I was designing it, I was actually afraid that people wouldn't understand how to "solve" it, but it seems that almost everyone has understood it.
Anyway, thanks for the feedback :D