Even thought singleplayer campaign is main part of the game and I spent majority of time developing it, you may have noticed that there is also the local multiplayer part. That means that you can play it with your friends only locally on one computer.
If the multiplayer part will be popular enough, it may get an online patch in future.
If you are locked down alone in your house, there is also multiplayer mode that you can practice by yourself. Race mode. Every good race game should have a ghost mode. That means that you can race against your own best time. This way practice by your own is much more fun and it will help you to beat your friends next time you meet. And last but not least, the replay feature shouldn't be missing as well.
Here is the gameplay video featuring me racing against my ghost from a months ago. It took me some time to beat it.