I got to the arc furnace part in the tutorial, I like the cute pixely 2d craft block world. Firstly it is possible to softlock yourself after welding the 2 white blocks together if you take them up the jumping squares and fall off of the jumping squares (where you have to press S), so I would tell the player to leave the welded white block there or something. The second problem I had was with the initial inventory tutorial, you should mention in the announcement that the blocks stack. Thirdly the part where you mine through the dirt with the copper veins was very long and tedious, I feel tutorials should introduce a mechanic in a short and sweet way, fewer blocks to mine and weld etc. Lastly I'm not sure why extractors give infinite ore, kinda weird, you do need an elevator at that part so I would consider making the player extract the green ore and use it to power an actual elevator.(if possible) and the bridge you need to make after the arc furnace seemed really long to make, I'd tell the player how many metal bars they need to make and make the bridge required shorter. The welding is cool and the inventory aspect I like. Sorry I had many criticisms but I see good potential :)