 If you liked
Top wo Nerae! Gunbuster
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 ...then you might like
Suisei no Gargantia
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Like Top wo Nerae, Suisei no Gargantia features great space battles in mecha robots against aliens.
The abilities of the mecha robots are also similar to the ones in Top wo Nerae.
The aliens are of almost the same appearance as the ones in Top wo Nerae withe their flower like look.
SnG seems to have take great influence from TwN.