The last update was not actually the last update.  Here is a new version with a bunch of quality of life changes:

• You are now unable to get too close to a wall!  This reportedly makes the game feel less disorienting to play.
• Line thickness has been changed from 1 to 2, so that it's easier to see them.
• Darkened some of the colors, so that it's easier to see them.
• Nerfed the H level, and made the double U level smaller.
• Replaced the T-with-a-line-under-it level with something much less frustrating that still utilizes the same concept!
• Added the ability to remove the previous circle by right clicking.
• Rearranged the level order.
• Fixed being able to "click" by scrolling the mouse wheel.
• Increased the length of the circle explosions for slightly more oomph.