No More Room in Hell had Steam trading card support added on October 31, 2013. There are 8 cards in the series.
Initially, because No More Room in Hell is a Free Game, only participants in the game's beta were able to obtain card drops. Later, everyone because eligible to receive 4 card drops. Since then, however, card support seems to have been discontinued - existing cards, emoticons and backgrounds still remain, but no new cards drop and it's not possible to craft a booster pack. Whether random booster packs are distributed is unknown.