Level editor:
If I have my mouse on the upper right side of the screen, and I zoom in, it should zoom into the upper right side of the screen, not the center.
When curving a strip of land upside-down, and then adding a new node to the upside-down poriton, the new node will be perpendicular to the path, instantly red, and you can't place it.
Having a ghost-path view of the most recent test of a level would be nice
More keyboard controls like TAB to switch mode or R to retry a test would be nice
Bike physics:
going down a big hill is limited by the wheels
going fast right, then going up a half-loop and moving fast left, when you land on your wheels, you lose your momentum
I made Skirrt the Irrt (DNQ4G)