I HAVE UPDATED THE LEVEL EDITOR A BIT

Now there are some hotkeys:

• plus and minus keys press the plus and minus buttons
• shift + plus and shift + minus change the song
• numbers 1-5 select the object types on the bottom
• tab switches to play mode

I have also made some helpful improvements:

• holding shift while drawing draws in straight lines
• the icon for draw has shrunk making the plus and minus buttons easier to press

Thanks!