The level editor and practice modes have been merged, into a new mode, "Workshop". In this mode, you can manage your custom levels. You can also now upload and download levels from steams workshop! From this screen, you can also chose to play or even modify existing levels! Enjoy~!

For now these features are only available on the test branch. If you don't know how to do that, go into the steam properties of the game, and select that branch. I've made it a branch, because, of course, if there's any bugs, you can also switch back to the old version. At the moment it's only available for windows, but shortly, I'll make a Linux port as well.