The way the audio built up as the tempo built up was a really nice touch. Making the player learn the rules by trial and error is an audacious choice for a jam - I like it! A really cool and innovative effort.
I'm not sure if there was a bug or something (or if it just ran slow on my ancient machine) but I found when I got to 185 the game just froze then jumped to slightly over 200 and said I'd stayed in the same column too long.