Not totally unusual for a first flight.
When will they test stopping it with brakes alone? That should make an interesting picture, because the wheels will be glowing red hot.
The rejected take off test is always the most exciting and most dangerous. The brakes will catch fire and there is also the risk the fire will spread as they have to sit for 5 minutes before the firemen can put out the brakes. This is to prove the aircraft won't go BOOM while passengers are evacuating. Of course in the process every tire (except the nose gear) will be destroyed.
Supposedly that test alone costs millions of dollars.