These are ASCII maps for each of the levels and bonus rooms, showing each warp in the game. There are no additional warps than the 3 we already know about. For fun I went through the code to see if I could reliably fix some of the RNG with sub pixels and sabretooth, but unfortunately there's nothing that can be done.

For subpixels you can reset them by dying and they stop updating when you're at max speed, but increase whenever you're in the air or accelerating/decelerating, so even with a setup it stops after the first jump.