If you're looking for anime similar to Doraemon: Featherplace, you might like these titles.
In a distant galaxy, a robot society plans to invade Earth and take humans as their slaves. A robot named Riruru is sent ahead as a scout who will make the necessary arrangements for the invasion to occur. Luckily for human race, Nobita accidentally interrupts this reconaissance mission. Nobita and his friends will then need to somehow face an entire army of steel troops and stop the mechanized offensive.
Nobita's dad stumbled upon a strange advertisement of a fantastic resort on television at midnight. Sleepy as he was, he made a reservation even though he didn't even realize he was talking to the advertisement. The next day he discussed with the family their holiday plans, only to realize he could not find the place anywhere on earth. All of a sudden though, there was a suitcase in Nobita's room and intrigued as he was, he opened it only to find a portal to a beautiful resort managed by tin robots. Better still, it's absolutely free. However, it seems that there is a hidden agenda behind the person who invites them there.
Nobita has been having a weird dream about a boy named Roppel and his strange companion Chami traveling in space. By a twist of fate, he met them in person where it turns out that they are real and that they were being pursued in space, causing their space vehicle to malfunction, connecting the space vehicle itself with Nobita's room. They journeyed to Roppel's planet and amidst their enjoyment, Nobita and Doraemon pledged to help Roppel's planet free from their oppressors.