Need help creating 2D image clicker game

Hello, I’m trying to recreate a game called “Buriedborne” which is a hardcore dungeon RPG, but I’m unsure how to create the combat system.

The game consists of picking a character and joining a dungeon, you are presented with 3 different rooms which have different things in them, such as monsters to fight and events, as well as health pick ups.

After defeating an enemy you have a chance to gain a new piece of random gear and then you are presented with the next set of 3 rooms, until you clear the whole floor.

The game hasn’t really got any animations, the dungeon rooms are images to click on and the enemies are just images as well, same for the spells and attacks.

I’m just needing some advice on how to create a system like this, enter a new scene, presented with 3 different rooms, you can click on them and move to the room to fight a random enemy, once the enemy is beat, takes you back to the dungeon screen and presented with 3 new rooms?

Any advice or help would be appreciated, as I’m new to this.