Cool and trippy mod.
But I have no idea how to reach that spring.

It's great, but it has some game breaking bugs. You can jump through the ceiling and then you have to restart the game. When you go to the menu, you can't choose anything. You have to quit the game using ALT + F4.
Apart from this, it's a great precision platformer. Looking forward to the full game. Always happy to see Celeste inspired precison platformers.