First off, I bought your last game on steam and have played it and I liked it. This game is much more complex and interesting. Level seven is a very difficult level, the other ones I played felt easy by comparison. I got stuck on level 12, and I discovered a nice tech. If you hold left and down and then jump, you always get a clean slide.
Anyway, how do I make this jump? I am very curious now what's up with this. You can see in the gif that I did a regular jump and a super jump, and I swear I did this more than 100 times, so I don't get it, maybe I'm off by a block but this jump got me. This is as far as I got. Cool demo, thanks for posting. 