Hmmm...1-2 and 1-3 are just repeating a certain pattern, so if you know how to do it, you should be able to clear it...it's not harder than Dark Souls, so good luck!
Oh, I've set it up so that you can play with a mobile virtual controller, but if you're not used to it, you may have trouble with the controls (I sometimes get beat up in 1-1).If you can, try playing with the controller plugged in.
Thank you!