I'll be up front. If you're not into games like Dr. Mario, this game is probably not for you, as that's primarily what the gameplay is in Dungeon of Elements. The gameplay is primarily based around you throwing capsules into a room and trying to match 4 of one color, Puyo Puyo style, to remove all of the enemies in said room. If the smoke from the capsules starts pouring out the door, you're forced to retreat and have to start again. Outside of combat, you can take some of the loot you've found and mix it into a cauldron to produce improved equipment for your character as well as emergency use items that can help bail you out of a tough spot, or you can sell it for money.
The difficulty for this game scales relatively well, and the three different difficulty levels affect the starting drop speed for the capsules, boss health, and boss attack speed. Higher levels also start to increase the starting drop speed every now and then, and various obstacles placed within the levels impede your capsule movements, sometimes in downright evil places. But you can also use whatever weapon you have on you to kill off enemies in a small area or bring up your shield to temporarily slow the drop speed greatly (however that works) to help you.
Overall, I'd say this is a game worth at least trying out.