I'm surprised you haven't come across this https://www.galapagoscruiselinks.com/ Be sure and read the classifications of the boats under the About tab.
As far as I know, there are no other places to review the small Galapagos ships other than this forum. And not many people write reviews here. I've collected the comprehensive ones in the Top Questions on the right (not visible on phones).
Thanks. That site is helpful. There are so many spammy sites that I must have skipped over it.
I have used this site: https://www.voyagers.travel/galapagos/cruises many times, it basically compiles all the cruises you can take you're able to choose based on your budget. I came upon it while I was doing research since I took my first cruise this year and found some valuable info about cruising too
you can also check out http://www.galapagosadvisor.com - it may not be 100% up to date, but has excellent visitor site ratings function, a ship itinerary rating function and other useful information.
Full disclosure - my husband set this us a few years ago - but it's not very active.