Hey, thanks for the feedback! I think I uploaded a borked version accidentally, I did a last minute change to make the margins much tighter on gas usage. Oops.
As far as the laser is concerned, I think you're right. I wanted medium and hard to be much more hectic and to add to that I reduced the cooldown, but I think the feel of the game is much better in those difficulties, I agree. It'd be worth it to reduce the cooldown on easy to match up better.
Finally, with the traffic clumping, I absolutely do not doubt it! I spent what feels like 90% of the time in this jam tweaking and re-tweaking traffic spawning so that it was congested but not impossible, and I am not at all surprised to hear that it requires more work, haha.