Well, I've seen such bullet patterns working in several SHMUPS (albeit of a space-y shippy kind not rabbitty one) so I think that as long as amplitude of the wave will be low (like 32 pixels or so), it'll both look cool and work well.
Anyway, since UE4 is basically a 3D engine, any chances of bonus stages making their return? I think this is the best thing about first JJ game and was kinda bummed out it wasn't in the second (though as a game developer myself I understand now why they did it).
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