Yeah. Klax was great. I spent a lot of time playing it on the BBC Micro as a boy - possibly one of the last games released for the system. My high score was in the millions.
I was surprised to later find out just how many other end-of-life platforms it was ported to: https://en.wikipedia.org/wiki/Klax_(video_game) - who even signed off on all of this nonsense?! In particular, I have no idea why they bothered with the Atari 2600 version... how much did they make from that? Though I'm glad they did, because it's actually surprisingly good.
(The ZX Spectrum version is decent too! You'd think it'd struggle, what with all those colours, but it's well done.)