Very simple concept, but very polished execution. It was much more fun to play than I thought it would be!
I liked this a lot, so here's a dump of what I would do to improve gameplay:
- Greater visual indication of where the platform ends. Show more of the gap on each side and let the player see the boxes falling.
- Don't spawn powerups/downs until X time has passed, and don't spawn them directly above the player.
- Make the red/green outline around powerups/downs bigger and a different shade than the background.
- Add patterns to the boxes dropping and cycle between those patterns.
- Have a different, crunchier sound for boxes hitting the car vs hitting the ground.