This critter roamed on the garden tiles. It is a leafbeetle larva from the genus Cryptocephalus. It carries a case around its abdomen it created from excrements mixed with anal or oral fluids . They feed on dead plant material .
References1 Nederlands Soortenregister
2 KANG, Seung Ho; LEE, Jong Eun. Morphological and Ecological study of Genus Cryptocephalus (Coleoptera: Chrysomelidae: Cryptocephalinae) from Korea. 국립공원연구지, 2017, 8.3: 138-143.