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The fullscreen button should be available on the game (bottom right of the game window) to make the screen larger. I also responded to the scoring problems in a comment of my own.
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I responded to the negative scoring problem in a comment of my own, but for the car-steering-to-track, I mainly didn't do that because I wanted to stick with my primary idea of reversing "drive car around constant track" to "build track around constant car pathing". I also didn't adjust the car's steering because it would've taken much more time to program, and I wanted to make sure I had time for other features.
Thank you for playing my game!
To everyone having problems with negative scores, I noticed that they were possible at one point, but being the creator of the game it was hard to tell how well I was doing. I tended to get negative scores only for the later levels (ending in an overall positive score), so I didn't think too much of it. Scoring honestly never makes much sense to me!