Your game is looking great so far! While playing, I did notice a few things:
1. The player moves faster when moving diagonally.
2. When I was invincible, I would sometimes bounce when colliding with enemies, and sometimes I would not.
3. One time, I collided with a vehicle and flew into the air.
4. The cars are spawning on-screen. Maybe you could make it so they appear off-screen?
5. The player is safe as long as they stand next to the wall. The cars can't hit them there, so you'd have to increase the spawn range.
Besides those bugs, I would only recommend adding a score, maybe increasing the difficulty over time, and adding UI elements to the game.