Make no mistake; this is a very technically impressive game, and the visuals and music are to die foe right now. Turning also feels nice, which is impertinent in a driving game However, it is exceedingly easy to gain fuel, making the game easy, since there's no one else to race against, it gets repetitive fast, and re-spawning takes way too much fuel. Also the Hop is too small to ever do anything. I would recommend doing two things:
1. Re-balance the values of everything. Crashing takes away too little fuel, repawning takes away too much, boost rings don;t appear as often as they should, and group up too much, etc.
Many of these mechanics would work fine if the numbers were tweeked.
2. Make some actual levels. An endless mode is nice, but a game like this is dying for some racing tracks that are actually designed, an arena mode, and maybe even some objective based levels for single players.
This game is a great framework for what could be a great game. but right now? it's just that; a framework. So work with it! I'm sure with your visual and musical style, you'll turn some heads.