So checkpoints or back button as you have mentioned in other comment (also had this idea, wanted to offer you it today :) ) or other solution can help here imho :)
At the moment i was typing first comment i played only through 3-4, yesterday i did 3-5, 3-6 but could not get 3-7 from 3 tries. 3-6 is giving me a vibe of level 3-4 as well :) I also like 3-5 but it was pain to do it again after i moved box in unrecoverable state. I kinda disliked level 3-7, at other levels i feel that i can solve them by analyzing but here i can't cover so much, so i just was trying to bruteforce, 1st time was nothing got stuck, 2nd time i moved one box got stuck, 3rd time i got half of the board cleared but somehow could not progress :( I've tried to see if i can move boxes from any angle but i could not, at that point unfortunately i gave up but would like to see other levels especially in the style of previous levels, well done overall anyway :)