Game is great so far. My minor feedback.

[MARl0]

My only minor suggestions at this point would be:

To add a little more punch to the boost sound effect. It sounds a little toothless right now, which lessens the impact.

It'd also be nice if the machines had more animation when powering up at the starting line. They just sit completely still and hitting the accelerator before the countdown only shows the engine light turn on with a single frame of animation. Just needs a bit more to it to feel natural.

Make the drill diving timing for the smooth landing a tad more forgiving. It seems unreasonably strict.

Beyond those super minor issues, this is off to a shockingly great start for an early access game!

[Emarcee]

Another suggestion would be to give each machine its own boost sound, but that could be a lot of work.

[GroZeiLLe]

I also think the boost sound is too shy. And we are missing a "wind/engine sound" relative to the speed.