Arknights is the GOAT of TD gachas, but there are some others worth checking out.
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Path to Nowhere: A bit more dynamic and great gameplay.
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Counterside: Side scroller and less about positioning, but it is a tower defence with an attack feature.
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Watcher of Realms: It’s an AK ripoff and bad monetisation, but it is AK with multiplayer.
For turn based stuff and not just defending a tower?
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R1999
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Langrisser