Thanks so much! I'm glad you came back now that the game is functioning, I appreciate the feedback :]
I had the same issue while testing my game, that depth perception on the top edges can be surprisingly tough with the lack of texture variation and geometry in the environment.
I will be continuing work on this for roughly another week, so I'll see what I can get done! Thanks for your encouragement :D I think I'll add some bushes, trees, rocks, and textures to the ground, maybe different textures for the sides of the ground, that should hopefully help with detecting those top edges a bit better!