 If you liked
Tensei shitara Slime Datta Ken
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 ...then you might like
Nidome no Yuusha wa Fukushuu no Michi wo Warai Ayumu
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Both Protagonists go to another World and see magical creatures etc
But Nidome no yuusha is a bit darker than Tensei shitara Slime Datta Ken
Nidome is about a guy that wants revenge after being betrayed and so he swears that if he ever get another chance to get it he will make sure to make everyone have a Slow and Painfull death.