I just love dark games. And I like hardcore games, so I couldnt pass on Madness/Endless. Its gameplay feels unique, since dashing and slashing isnt the normal way I fight enemies. But the pace and style makes it almost perfect.
Gameplay
Madness/Endless is a top-down fast paced action dash & slash mobile game. You move on the edges of the room and dash between them, slicing enemies in the process. And you will lose sanity over time, which is basically your timer/hp. Enemies oneshot you though, so be careful not to get in their sight.
There are different types of enemies, starting with pretty useless mobs, that cant attack, enemies who have their "sight" area, so if you get in there - you die and all the way to the enemies with self-guided projectiles, armor and that require several hits to be killed.
You will have to go through several procedurally generated rooms in order to complete a floor. Once floor is done, you are at a checkpoint. So if you die, you start at that checkpoint, basically start of the floor. Once you complete enough floors you can go to the next dungeon, depends on where the story will lead you.
Story
You are doing all that massacre for a reason. Although that reason is deeply hidden, so you will have to learn it the hard way. You can make friends along the way, but its very likely that you will just kill them too, so be careful on the dialogue options.
Moreover Dungeons arent everything Madness/Endless have. You have a base of operations with some survivors out there. Every time you die you resurrect right there, in that fountain, but you can see that cinematics only once.
There are some NPCs you can talk to, but most of them are pretty out of their mind, so dont expect any meaningful conversation.
Conclusion
Madness/Endless is a great fast paced game. It have unique playstyle and atmosphere. If you like the feeling of despair, like in Darkest Dungeon, but a bit more fast paced, you will love it. Dont expect an easy playthrough though, as the enemies get stronger they will be harder and harder to kill, so you will die. A lot.