It's a great demo, but it's probably quite complicated to implement. The problem with demos like that is half the challenge is keeping it usable when you scale up the engine to something as complex as Construct 2. I've got on my todo list a "live preview" feature which should help, though - ideally it will allow you to make changes, hit preview, then the game updates with your changes, but keeps its state. In other words if you're previewing and you've got to level 3 with 55% health, and you just tweak a particle object's rate and hit preview, the particles object updates and you're still on level 3 with 55% health.