You should make it so after you beat a day/night it unlocks the ability to replay them. With this there should also be a new difficulty selection. Normal, Hard, Impossible. There could also be different modes like super bouncy or super fast IDK. If you did do this and had achievements for completing all difficulties on a day or night I would do them. It would also be better if you had a bigger variety of achievements like in the first game it would be sick. Anyway, hope you are adding onto the storyline and making more.
#Better replay ability
rare venture
river nacelle
disagree, I think that takes too much away from the story element, they should just make the ai defaulted as hard, and should introduce an easy option like they did on hello neighbour hide and seek (this idea could work as part of the hello-copter dlc tho)
there should definitely be a level select though, just like the previous hello neighbour games