Dear Plarium, there are some basics to software development and testing that you seem to have ignored. Whatever method you are using: waterfall or agile, devops or anything else, your developers have a duty to unit/component test their software. You as a company have a duty to system test and integration test your products and Beta testing is a final stage where your product is almost ready to be shipped. Beta testing is not something you force on your customers to test for you so you can avoid investing in internal testing!
If I can use the analogy of building a car, when you take delivery of your new car you expect the wheels to go round, the axle to be connected to the steering wheel, the gear stick to be connected to the gears. When you go for a road test you expect it all to be working except for some minor faults like the radio not working properly.
These minor defects can be fixed before you take delivery. Your approach to software testing is to ask your customers to test it all for you and worse you do not seem to fix the issues they find anyway.
Customer satisfaction is the key to any company's success and your disregard of this fundamental will, in the long run, be detrimental to Plarium.
If I was your competitor, I would be looking at the volume of complaints of the new version and I would be offering your customers like for like migration. Customers can set up in new games with the same amount of troops and resources as they have in Sparta so they do not have to start from scratch.
Once any company loses a customer it is almost impossible to get them back and when a customer walks away from your product they take their credit card with them and they also tell their friends of the poor experience they have had with your product. This then spreads,
In the age of instant messages, instant feedback, Plarium is not in a position to force a product on its customers where it is obvious to anyone that uses it that the internal testing that has been conducted is sub standard and that as a Beta version this falls far short of what anyone would consider fit-for-purpose.
As a professional test consultant I am willing to provide 1 hour free consultation on how to test software after which Plarium can hire my services at my normal hourly rate.
Don't upset your customers, without them you don't have a business!