Note the lack of “(Demo)” in that thar title. I bought it with the last of my points (well, not the last – I have 100 left that’ll buy me almost nothing).
I’ve played and completed all of the Beginner levels, passing them all under par first go, bar one – the one you have to finish it in 20 seconds or less, but can’t. Turns out there are five “time travel” power-ups you can collect to make it possible. For this, I’ve now gained three Marble Blast Ultra achievements – get one under par, finish Beginner, and finish all Beginner under par. Hurrah!