I bit late, but here's the change-list to yesterdays update:

• Improved performance with many units, especially on horde.
• Can start horde in higher waves and with more units.
• Assault: Fixed "Decorated" challenge, increased score per completed stage.
• Avalanche: Increased power-up spawn frequency.
• Fixed spawn-circles sometimes getting stuck in "Assault".
• Roundabout: top and bottom spawn-circles are now the same size and have higher spawn-rate.
• Can now switch between smooth and linear scrolling.
• Can tune the strength of the screen-shake effect.
• Can set higher scroll speeds, up to 4x.
• Fixed key not showing up for the "Focus Bombardment" tool-tip.
• Fixed buff display not properly positioned for 2nd player.
• "Ignition Point" unit blast radius is now fixed to slightly smaller than half the default bombardment radius.
• Spawn-circle level upgrades limited to 2.
• Horde: Spawning horde units will now "telefrag" hostile units under them.
• Horde: Need to keep at least one spawn-circle to survive.
• Horde: Horde units will now use auto-phase in later waves.
• Horde: Horde units will now try to dodge bombardments in later waves.
• Horde: Horde units have a 2s immunity after spawning.
• Finale: Fixed a crash that could happen after finishing the map.
• Finale: West spawn-circle is now inaccessible before cyan opens the region. This was not working as intended.