I like it quite a bit. There are a number of things that I don't fully understand yet, but I'm putting that down to the pre-alpha nature of the test.
Purity as a name seems very weird to me, unless there's something you are planning in the metagame later on to account for it the name is very jarring.
One thing that you may or may not have planned that I think would be very helpful/cool would be to have icons/symbols/heraldry/whatever associated with each immortal and each pantheon, that have to start very simple but you can unlock better/more involved design elements as you spend more Prime and Purity. That would give a quick and easy way for everyone to see more powerful/involved immortals and pantheons at a glance.
