Yes, the turrets were supposed to explode :D A small idea I decided to include.
The simple timer was activated by the "cube flung button" which is connected to a latching system. This means it must only be pushed once. Even if the cube falls off, it will still activate the timer. The timer activated the "bridge" of angled panels, one by one. While not complicated I thought it made a nice test and so I published it.
The flip panel and laser were SUPPOSED to stay open; the system was latching. It was not originally this way, but it was difficult to align the cube perfectly onto the button, and the latch made this easier. Thanks for the feeedback!

I saw the timer, it was just confusing as to how that mattered for the most part. The ~ flip panel was buggy and would remain open after the initial cube throw. I'm assuming I was to throw the cube through the first flip panel to hit the cube button on the far side, but it took several tries to do. The button lowering the platform for the reflection cube seemed pretty straight-forward, not sure why that was needed. Not bad for a first try. I liked how everything exploded in the end. At least I think that turret was supposed to explode...