Hey really solid idea!
I like that you kept it simple in regard of polishing it well. That is good for the gameplay. Everthing works fine and is really smooth! Good job!
The only thing for me to complain (because besides this its really good) is the timing or rather pacing.
I got a bit bored in the beginning and after a long while speed escalated so quickly. I would rather speed up at the beginning, such that you increase the pacing more in the first few minutes and less later. So you will have more fun in the beginning and will be more challenged to hold longer.