Overall I think it's a pretty neat idea and I had a good time. The idea you were going for is clear and anybody who spends a few minutes with it can pick it up.
The rest are nothing more than nitpicks but here's a few comments.
The initial difficulty came from learning the sounds that were in the game. Once I got familiar with them my next big issue was to figure out the timing . I'm not sure if this is intended but if I press too early the game would kill me even if I had the correct input for the sound that was coming up. Once I got that down, I could survive to do a descent run but the window might be a bit too tight.
If you're gonna turn this into a full game I would make the window bigger or find a different penalty for an early press. Maybe you could lose a point, It would keep the player playing for longer instead of restarting.
Bonus QA, I was able to make the game crash if I was quick enough and pressed space bar at the start of a run.