My favourite game of all time is Hollow Knight so this review is going to be very subjective. If you played both games you probably understand why. If you have only played Haiku, the Robot (although highly unlikely) and enjoyed it, then play Hollow Knight. Haiku "borrows" so much from Hollow Knight that I couldn't help myself from being disappointed every time I noticed a similarity between these games. I'm sure that Hollow Knight also borrows ideas from other games, but the amount of content in Haiku that I could trace back to Hollow Knight is insane. The enemy design is extremely similar, the powerups are, with few exceptions, the same and the story just feels too similar. I know I am biased but it was really sad to notice all these similarities, especially since I enjoyed playing Haiku for the few hours of playtime it provides. I could go on and on, but I think it is not worth your time or mine. If you enjoyed Hollow Knight then play this game too, but don't expect to be bombarded with anything brand new.