 If you liked Tengen Toppa Gurren Lagann Movie 1: Gurren-hen |  ...then you might like Rakuen Tsuihou |
Both anime focus on main protagonist that live in a city that is detached from the real world. Also, in both anime, Earth has been turned into a wasteland where people have to struggle for their survival. The anime have similar dynamics between characters. They also have a similar mood, some fanservice and mecha fights. The main difference between them is that, at times, Gurren Lagann is a bit more goofy, and has a different art and animation style.
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