So for the past 3 months I had basically very little time to actually work on Sandbox Play which is why this update doesn't add anything drastic.
Switching to a newer engine of Unity is the key point of this update as it gives the game a boost of up to 15% in performance.
You can read about the rest in the update log.
I will start releasing updates in the following weeks with a lot of things planned. Hopefully it'll give the game some life back after a long break.