Dreaming Dimension is a 'deck-building roguelike' where, unlike what happens in the popular Slay the Spire and other similar titles, you can move freely through a 3D setting divided into squares. You can gradually explore the map, where you'll find treasures, enemies and other dangers.
The combat system in Dreaming Dimension is very similar to that of the aforementioned Slay the Spire: you'll have three energy points on each turn, which you can use to play the different cards in your deck. At the top of the screen, you'll also be able to see what cards your opponents will use, so you'll have to try to act accordingly, playing offensive or defensive cards as appropriate. The most important thing, as always, is to learn how to create synergies with your own cards.
Every time you win a battle, you'll get coins, experience and the possibility of adding a new card to your deck. It's important to keep in mind that it's not always a good idea to add cards to your deck, as sometimes it's much more useful to have few cards that complement each other very well. A small but efficient deck is much better than a deck full of powerful cards that aren't able to create synergies.
Dreaming Dimension is an excellent 'roguelike' card game. It has an in-depth and fun combat system, and great graphics. The game also manages to add new elements to the increasingly exploited formula from the great Slay the Spire.