We hold 13 games from Sergey Karakozov, going back to 2013. They average 4.4 across 10K ratings, and that average, weighted by how many people left it, is the whole of their score. The best rated of them is Idle Monster: Happy Mansion at 4.7.
Everything we hold from them is free to download. Some of them sell a subscription, which the game page spells out.