This isn't 1d8+int, just 1d8. I agree that being able to bypass resistance by changing type is powerful, but getting talents extremely slowly compares to other casters' cantrips, who will have the opportunity to branch out faster, negates that a bit IMO at mid and higher levels.
I have no issue with Mind Thrust as int save vs psychic damage makes perfect sense, as do Hammer and Slam due to the additional effects.