4 stars: A few things hold this back from being really really good. The main one for me is that the recipes are really random. For example,
4 stars: Good game, but would be an excellent idea to add a mode where you build your own factory from scratch. Also there should be either a way to permanently show portal links or to color code them, and possibly some sort of different color for locked buildings. Otherwise would be 5 stars :)
3 stars: Not a bad idea at all in theory and I can see potential. However, the game lacks engagement and is very slow. The controls have room for improvement and not much can be said about the quality of graphics (it's assumingly a newer game). Again, the puzzle aspect holds potential, but some consideration needs to be put into improving player engagement.
3 stars: It makes me irrationally irritated that there is no way to predict which resource will have priority when you merge into a belt. It doesn't alternate, and you can't reliably predict if a belt loading from the side will block or be blocked. 8 could mix four resources into one belt in precise ratios, but if it ever backs up, the merging does whatever it wants instead of being predictable.
2 stars: the game has potential, on a pc with a mouse it might even be good but the placement esp of conveyor belts is awful on a phone. the tutorials as well aremt clear level 4 took me 8 goes to complete following the tutorial. good potential idea but things let it down I'll stick with...