Why 5 stars for a "lesser Factorio"?
If you like Factorio, I'd recommend playing this and sticking through past the end of the campaign.
The campaign itself is a linear progression where you produce and deliver increasingly more complex "shapes" to the main hub. There are no survival elements and no character to play as: this does make Shapez more shallow in a sense, but also it can be nice to just focus on building factories without distractions and inconveniences. The only action that consumes any kind of currency is copying and pasting, but that currency can be produced relatively easily. All-in-all, pretty addicting, but might feel like "lesser Factorio" to some.
The post-game is where Shapez really shines. Throughout the game you unlock various logic gates and wiring components - things that are present in Factorio, Minecraft etc. but usually are not given any real reason to exist. Here though, past the end of the campaign, the game starts demanding production of randomly-generated pieces - a task that's tedious to do by hand, but is a perfect excuse to build a computerized Make-Anything-Machine! This alone provides enough depth to the game to warrant 5 stars IMO, there's just no reason to build anything like this in Factorio given that all recipes are known in advance.