Not bad. The concept works. The puzzles are relatively straightforward so it does feel a bit more like a race than a puzzle - but you realized that and noted it in the description.
One small problem is with the controls as the pace picks up. On a laptop trying to do fast and precise mouse movement on a trackpad is tricky. It gets a little bit harder with the sole use of WASD for movement instead of arrow keys, because some laptops temporarily disable the touchpad when most keys are pressed to prevent accidentally moving the cursor while typing. My laptop for example has a nearly one second delay between pressing any letter/number/space and being able to move or click the trackpad.