I beat the demo, and it's a great game, with lots of potential! A few things I noticed.
First, a bug. The range on the magnet, at least at max level, is significantly shorter than the circle indicates. As you can see in my screenshot, the shards on the bottom middle are well inside the ring, but not being sucked in.
Second, it gets extremely grindy near the end, with basically nothing I can do other than leave the game running to try and get the last sensor upgrade, and the last 3-4 of each type of mainframe booster. Hopefully, the full game has more upgrades to increase the generation speed of each resource.
Finally, it would be nice to see additional upgrades after "Technology" on the left, and maybe more types of reactor upgrades, too.
Viewing post in The Rift Machine (Demo) comments
Thank you for playing through the demo and for the detailed feedback!
The magnet range issue does looks like a bug, I will investigate it.
There will be more unlocks and upgrades for the reactor and the tech-tree. Some content were disabled for the demo build, which unfortunately led to balance issues towards the end.