Yes the game is in an earlier stage and is just starting off with a lack of content, but they can't improve it unless we give criticism or feedback, negative or not. These are crucial things they need to know going forward. To anyone reading this going "but it's alpha", they can't improve or learn from anyone if the only feedback you give them is "we know it's alpha we hope you make it better". I know a lot of people compare this game to Factorio, but it's clearly been inspired by it, and Factorio really does a lot of things right, it obviously shouldn't be used as a bible to making this game succeed, but there is no problem looking towards it to get ideas for this game.
For my first point, to put it simply, the game has too much "set it and forget it" moments. You're not constantly struggling with ratios and trying to perfect the factory, which is a challenging aspect of Factorio that extends its playtime in a fun way.
It's way too easy to make everything, and when I played with a group of 3 other people, we actually found it easier to set up basic production lines and just hand craft the more complex stuff to complete milestones. It was faster for all 4 of us to handcraft than it was to wait for machines. That's a huge problem.
I think you shouldn't be able to handcraft complex recipes or combination items (except for maybe reinforced plates), and research should take more time and effort. At the very least, handcrafting shouldn't be as fast as it is.
The game up to tier 3 felt far too easy, and between me and my group, we researched everything within the first 4 hours (it was mostly me building everything while they explored) and felt no reason to continue playing after that.
What's the point of continuing playing and building if there's nothing left to build towards? There's nothing left to sink resources into, so our factory just sits there never moving. They need to focus on extending the playtime, because the building aspect, while nice, doesn't save the game. There's currently only floors, ramps, catwalks, and pretty plain walls, it's not like you can really do any creative building yet utilizing those.
There is also no threat to you really, no pressure to set up defenses from enemies. Expanding your factory doesn't consist of tower defense, so it feels too carefree.
Exploration also falls flat. The map is definitely nice, but there's not much to really find or do in it currently. You can go slug hunting and exploring caves, but what else? I'm sure they will add a greater purpose to exploration later.
Going back to factory logistics, and taking Factorio as inspiration, Satisfactory is too easy. Most research is done by hand, and it's faster to hand craft most things by hand. Whenever you get to the next research tier, you usually don't require items from the previous tier, which means areas of your production line become obsolete. Most of the time, by the time I set up a line for the next research tier, my friends already hand crafted enough, making the factory line I just made pointless.
We ran out of things to produce in the alpha, and our factory was halted. The only thing we could do was shove things into storage containers. Factorio had you dump resources into science packs, also creating a need for past and future lines to exist, constantly feeding resources into slow and consuming research.
Another issue I had was the power situation. Once you get to coal, it feels like there's little need to upkeep energy. I spent an hour creating a massive coal plant consisting of more than 8 coal generators being fed from coal far away. After that, there was no need to worry about energy. When you needed more energy in Factorio, you had to rethink your energy line, and build out a new area to expand it. After that, you needed to meticulously set up defences to guard the new area you just claimed for energy. In this game, there isn't really a threat, so you can kind of just build wherever you want without worries.
Regarding the UI, it's a little unresponsive at times. Sometimes it takes multiple shift clicks to register, and I noticed the more complex the factory gets, the longer it takes to open certain menus. Besides that, I think the UI is finished, whoever worked on that did a great job. It's not bootleg and default feeling or looking.
I really like the game, and I feel Coffee Stain has the capacity to finish it and make it something better, but I just hope they don't make the game too easy as it stands currently.