itch.io

The game has a good solid engine.  To make the gameplay more varied, perhaps there should be some boosts and jumps to break up the gameplay.  The AI needs to be more spread out, instead of clumped together in a pack.  A good solid foundation to build on, the artwork is cool and the racing mechanics are solid.  Perhaps show lap times during the race along with best laps.

I've just downloaded this, and it looks good, but I wish there was a tutorial about how to use the script that is outputted by the program in a Gamemaker project

I like the low poly style.  If I can suggest that when your player collides with a golden wheel or powerup, there is some sort of visual feedback, like a flash of light to indicate you have picked it up.  Also, if the sand can be textured (it currently looks like a glossy yellow floor).  I like the low poly skeletons, they look cool.