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SolSeraph got some attention before its swift release by claiming to be the spiritual successor to ActRaiser. If that were so, ActRaiser would be turning in its grave.
A dreadful action-platformer bolted onto a pitiful tower defense, SolSeraph is embarrassingly cheap, tacky, and boring. It looks and plays like a mobile game, and is way overpriced.
Just play Bloodstained. Even if you've already played Bloodstained.