I like the concept of flipping every time the timer runs out, and the idea of the gate that only opens on the last three seconds of the countdown is a cool idea, but there were a lot of times where I wished I could just control the gravity myself since the level design put an obstacle in the way and I had to wait since there were 5 seconds left on the clock until it flipped. Kinda wish the detonator panel was used more to avoid those scenarios.
Still, despite that it's a cool looking game and you used the assets really nicely. Great job.