Well this movie was what you would expect from a Japanese movie, somewhat odd and not your average mainstream mass-produced Hollywood type of movie. But this particular oddity of a movie is not suitable for everyone. And I, however, wasn't in the target audience.
What worked for "Instant Swamp" was the quirky characters and the absurdity of their personalities. That being said, then at the same time, these characters were a bit too out there most of the times. And a lot of the things they said and how they reacted to their situations around them was just too strained.
And it should also be said that the people they had cast for the roles in the movie did really good jobs individually.
I found "Instant Swamp" to be a struggle to get through, and actually had to watch it over two times, because I found it too uneventful for a single watching. So I watched half of the movie in one day, then returned for the last half on the following day. That, however, sadly enough, wasn't helping to add to the level of interest I had for the movie. The movie was moving forward at a slow pace.
I enjoyed Satoshi Miki's other movie "Turtles are Surprisingly Fast Swimmers", so I had some expectations for "Instant Swamp". But the movie just didn't live up to what I had hoped for.
Sad to say, but "Instant Swamp" failed to sweep me off my feet, and however much I like odd characters and quirky characters, then "Instant Swamp" wasn't in my liking, hence the 4/10 rating.