Renowned as a short story and novel writer Santosh Kumar also tried his hand in other literary forms like drama, poetry and essays. Two of his plays,
Ajatak (1969) and
Aparthibo (1971) are worth mentioning. As for poems there is a collection named
Kabitar Praye (1980). His first published poem was 'Prithibi' (Nabashakti, 1937) and first published short story was 'Bilaati Dak' (Bharatbarsha, 1937). Amongst essays are 'Rabindrachinta', 1978, 'Rabir kar', 1984. Apart from these Santosh Kumar also tried his hand in juvenile literature. 'Dupurer Dike' written by him which was published in the year 1980 was meant for such young adults. His first novel was
Kinu Goalar Gali (published in 1950 in the magazine
Desh) which immediately caught the attention of readers and contemporary writers.
Sisir Kumar Das wrote that "his forte is the impact of the socio-economic changes on the moral life of the middle class". In 'Nana Ranger Din' the nationalist movement of pre-independent India is voiced through the autobiographical perspective. In 'Mukher Rekha', 'Jal Dao', and 'Swayang nayak' and 'Sesh Namaskar: Sricharaneshu Maa ke', where Santosh Kumar has combined the autobiographical and confessional mode of narration to deal with the roots of different social evils. Shesh Namaskar has been translated into English by Ketaki Datta under the title "Shesh Namaskar (The Last Salute)" and published by
Sahitya Akademi (2013), . A continuous seeker of new fictional methods, he wrote 'Renu Tomar Mon' in second person point of view (which is still unique in Bengali literature) and at the same time combined poetry, essay and story in his book
Mile Omile. ==Awards and recognition==