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A bit of background: Playdate has very basic collision detection which can't handle much other than AABB collisions. This means that there isn't a standard way of handling collision for the slopes which is a problem given that it won't be much of a game if you can fly straight through the obstacles.

To get around this, I defined a centre line and acceptable deviation per section (red lines in the video) and then all I had to do was calculate how far from this line the player is. If they're outside the acceptable deviation, they've hit a wall.

Once I've found a collision, I just need to push the player toward that centre line and voila; half-decent, non-AABB collision with no impact on performance. If you code it correctly. I did not code it correctly.