Pros:
I like Rhym because its very quick to deploy a games quickly, I would say it takes me about 5-10 mins from choose a game from their template to deployment. They do have a good selection of games to choose from which I like.

The editor was easy to use too which I can easily replace with my clients projects. Also noted that they recently have a major update with CNAME for each workspace .

I have Rhym about 1.5 years since it came to appssumo and the founder is very responsive. Last year the co-founder Ekta Singh even helped me to create a game specific brands to my potential clients in less than a week.

Cons:
While its not 100% perfect, like currently the background music doesn't play, one of the games doesn't work on mobile for some reasons. I believe the founder and his team is working on it to quickly resolve those bugs.

Would also be great if it can meet the GDPR and equivalent US data privacy .

If you are thinking about Rhym, I recommend you to check it out.