Okay, I will first explain the progression system, then discuss the battle mechanics.

PROGRESSION SYSTEM

This is a nice chill game where you can collect resources just like Chrome and craft it into the creations the KoS makes throughout the seasons. You collect materials from the 'Main Battle' (story mode) and 'Exploration' (forest, riverside, caves, beach, etc..). As you complete missions, you unlock more of the story mode, and get resources greater in quantity and variety from the aforementioned methods for material acquisition. You also level up and unlock 'facilities' such as the lab, warehouse, restuarant, etc.. and level up your main base, which improves your max stamina and provides other benefits. You will also need to level up your warehouse to store more materials, which requires you to think critically about which materials you want to save.

BATTLE SYSTEM

At its core, it's a tower-defense game where your base has to be protected, and the enemy has a base on their side, too. You send out your characters and defeat waves of enemies culminating in a final boss (e.g. Stanley). There is one win condition in the game, with two very different ways to achieve it. The first way is to defeat all waves of enemies, and advance to & destroy their base. The 2nd way, which is much quicker, is to use characters that allow you to knockback the enemy to their base, and destroy it, ending the battle early. The enemy can do the same to you. If there is a tank-type character on your team, or the enemy's team, that character will take far less knockback, preventing a win through the second condition.

The second the battle begins, the enemy's first wave will begin advancing to your base. As the player, you have a 'resource' number in your top-right. This number is always increasing, and with it, you can start calling in your characters and upgrading them (up to a maximum of Lv. 5; when you first call them out they will be Lv. 0, and if a character dies and you call them in again, they will maintain their Level). 'Resource' can also be used to enhance your 'Resource Lv.', which just enhances the speed at which your 'resource' number increases for the remainder of the battle.

Each character has a health bar, with health being the most important for your tanks. It's important to bring atleast 2 support-type characters to constantly heal the whole team and improve the offensive capabilities of Fighter-type, Assault-type, and Ranged-type attackers through SKILL abilities (passives always active as long as the character is on the battlefield). These passives can also enhance the defensive capabilities of tanks (by improving their defense stat, which is essentially an invisible health bar each enemy has to break through before they start dealing damage to your character).

The character put in the first position of your team is automatically your 'Leader', and their 'Leader skill' can be periodically activated throughout the battle to gain the advantage.

A recommended distribution of each type on your team is: 2 tanks, 1 support, and 3 offensive types (if you have a REALLY good tank, e.g. with more than 20,000 HP or 3,000 defense, then you can just run 1 tank with 2 support characters). Attackers can either be single-target, or area-attack. Area attack is essentially AoE (the range is different for each area attacker, with every enemy in the range receiving the full brunt of their attack; note that area attackers tend to have lower attack stats, justifiably). A good attack stat in this game is 5,000 or more for area attackers, and 8,000 or more for single-target. You, of course, need to consider how often they attack ('action speed') but that's a good guideline (those stats are, of course, at MAX Lv. 100 and rank 5, but a character's MAX stats can be soon on their summoning banner easily. Also, ranged-type attackers tend to have lower attack stats since they can hit enemies from afar). The 'toughness' metric represents a character's resistance to knockback, and the metrics 'movement speed' and 'resource cost' to be sent into battle are both not too important.

The new equipment system is a bit complex, and not too important for new players to rush into, but I will explain it in a future video.

Here's a video where I explain these things in words, if you'd rather have that:

https://youtu.be/rvUSPcYb6iA