I’ve expressed for the longest for Tower Unite to have an official crossover with another indie game to potentially attract more new players.
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Crossovers = $$$
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Tower’s current incomplete status means jack! There are multiple indie games that aren’t finished and still did crossover with other games.
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Where to begin? That’s a good idea! My suggestion would be for Kalleira to be added to Fraymakers (another game that isn’t complete yet) as an assist character. That’s currently PixelTail’s best bet.
There are other possibly options, but this is a good place to start.