I liked it. I think it needs an upgrade that lets the loot float in space longer. It looked like a good chunk of the sun loot was being lost to time before a magnet would go pick it up.
I saw a comment on one magnet being useless and that's not quite accurate. I noticed it too, but it's not just that one is useless you have 1 while it's going slow and the rounds are shorter so 1 has less time while it's by it's self going slower than the same one does later on when it's got a partner or two. It's not just one magnet is dumb, there's the duration, and the amount of trash getting tossed up increases with the number of magnets so that is an illusion that one sucks. It does, but it's supposed to. I think it's ok as is unless you want to make the upgrades seem to suck.
My first magnet also caught almost nothing. Maybe starting it in a different spot would help, but for the most part, I think the majority of the reason is not that it was one magnet, but that the round was short and there was not as much junk in space and all the other upgrades we got before we bought the second magnet were not there when we first bought the first magnet and were disappointed at how bad it was. It did get decent right before I bought the second one. If they make the first magnet too good, then the upgrades won't do anything. Was I annoyed after buying the first magnet? Yea, but I would not change it. The upgrades helped. Everything else worked great.