Mining Factory

Good idea for the game but the game is about 20% finished now. There are a lot of different resources but only few of them have specialized machinery, the rest are just copy-paste. Balance is non-existent, some things don't make sense. Why positive review then? Because I enjoyed playing it for 5 hours until it became obvious that it is not finished yet. So if you want to try it for few hours without expecting a full game, I recommend it.
I am not sure if it will be ever finished as their other game - Mining Copper was released two weeks before this one and also has reviews that say it is unfinished (I didn't play it myself) and instead of finishing one game dev released another.
So what is this game about? There are three parts in it: mining, making and exploration.
Mining:
You have several resources and each one has a machinery chain which basically starts from drilling holes, transforming them into tunnels, digging resources, transporting them, processing them into final product (either green/blue energy or just some resource which you store to use in other chains). Each stage in chain produces next resource and can also produce gold. You use gold to upgrade speed and yield of each stage. Some chains don't make sense, for example, you load impure coal into truck making truckload of coal, then unload truckload of coal into more impure coal at warehouse basically making impure coal out of nothing.
Making:
You use green energy to create 5 types of units. Each unit has rank and level. You produce rank 1 units. You can upgrade their level with gold and you can combine two of the same rank into one of the higher rank of the same type. So to create rank 9 unit you need to make 256 rank 1 units. After rank 9 it requires 4 units of the previous rank to make another, so 1024 rank 1 for rank 10, 4096 for rank 11, etc. After you upgrade a unit to a new level with cash you need to craft enough units to at least get it to the same rank before you can use it, luckily if you combine few units, one of which has higher level resulting level will be the highest of them.
Exploration:
You choose 3 unit types and the first unit of those types (usually the strongest unless you reordered them) goes into battle. Each level initially has 10 enemies, one of which is the boss (which increases by 20 each 5 levels). Rightmost unit attacks the enemy, then central unit attacks the enemy, leftmost unit attacks the enemy, and then finally enemy attacks your rightmost unit, so use tanky unit at the rightmost position. If enemy level is higher than your total level of three units then enemy attacks first otherwise you can just kill them before they get a move if your units are strong enough. You get sources of resources as a reward for exploration which are used to produce initial resource in Mining production chains. The further you get the more rare resource sources you find but because there is nothing special about those resources it is still better to just produce initial resources to convert them to green energy and gold. Yes you get more chains but because they cost more to upgrade they end up slower so increase is not very noticable.
And so that's it. Mine resources, produce green energy and gold, spend gold on upgrades, spend energy on crafting new units, combine units, fight.