Unity 2D Tiled Puzzle Game

Hello everyone, I need your help to develop a simple tiled game. The map is 18x12. The mechanics are simple. You are free to choose whatever assets you wish(preferably not pixel art). I attach a video to show the gameplay. I need only 1 level, but the game must be created as there are multiple levels(not in the scope of this project, I will add them later). At the end of the project I will need you to explain me briefly how can I eventually change the animations/music, add maps and publish the game. I am a developer myself, so this won't be hard. In this game the player must bring all the orbs to a portal and then go himself to this same portal to finish the level. You can look at the gameplay video attached and then continue reading the description of the objects needed, which are listed below: A portal: allows you to finish the level. The orbs: must be taken to the portal to activate it and allow the player to finish the level. The key: Opens the door. The door: Is opened by the key. Sand tiles: Can be destroyed by the player when he walks on it, or by a nearby explosion. Walls: Cannot be moved or destroyed by anything. Rocks: Can be pushed by the player. If a rock hits an enamie/a bomb, the enamie/the bomb explodes. The bomb: Can be pushed by the player. If it falls from a distance >= 1 it explodes. An explosion(enamie exploding or bomb exploding) destroys objects at distance 1 excuded walls and portal. If an orb or the player dies in an explosion the level is lost. The enemies: 1) an enemie that moves counter clockwise. It has always a wall/object on his right side. 2) an enemie that follows you(no path finding), just dumb following.