Fun short little game!  I really liked it and the choice of music was great!

After a few rotations I can't rotate the hourglass anymore. Reloaded the game, lost progress, tried again and got the same bug. Seems to happen if I push through all of sand, then buy one more sand grain and shake the hourglass at the moment when this grain of sand has reached the point where it can be pushed through.

A really fun and enjoyable little game!

I enjoyed the challange of speed-running through platforms!!