I didn't used backgrounds because it would get blended with the buttons and therefore would obfuscate the position of them. Actually there is a way to avoid this problem but i don't know how to make it yet.
This is strange, i didn't experienced any issue while testing the level. Nevertheless now i removed the diagonal styling of the blocks, now it's ready for evaluation.
The diagonal lines on the floor screw up your jumps every now and then. If you wanna keep the same aesthetic but fix the occasional weird angle jump, you could make the diagonal lines be one pixel shorter so that they don't reach the floor and thus wouldn't sometimes affect the turtles jump.
After five years i've decided to finally edit the level. I completely redesigned the level while maintaning small aesthetics from the original one. I changed the moving box to three moving death circles, each with their own path and expanded the playing area.