That’s because Xojo is not targeted to that. For apps and utilities Xojo is great, but if you want a language for multi core parallel tasks targeting animations + physics at 60+ frames per second, Xojo is not your best option OOTB. By the way, the best options for such tasks are not Basic like languages.
So, in my opinion, if want to go towards Game Development, you should choose wisely your options, if you want a generic language for many tasks, Xojo is a good one. As you noticed, Xojo is not famous for its games. But we have ONE GUY doing an impressive job translating Box2D to Xojo, and you could try it:
You can play with the compiler without purchasing it.
If you get comfortable, you could buy the lite license for Windows only, and if satisfied, upgrade your license later.
You will get many answers here, no guarantees for all your questions, as people will desire you read the docs first.