Hey! Thank you for this feedback really helpful, I've heard a lot about the interact and capture button being different and a lot of stuff about the UI and I'll planning on sorting them for next update to improve user experiance.
The Brain button does nothing as off yet its a place holder for the whole training part which will be expanded on next update.
The Purple heart button, which once again I will make more clear in the next update which will be most UI and Training based.
The Purple heart button which I assume you mean can be used when you have the purple and pink bar filled to max, for corruption.