Hi Luca! I liked your game eventhough I didn't manage to complete it, no clue how you did it in 24 seconds though. I felt like I was pretty fast but around the 24 s mark I only was halfway throught he tower.
Overall I liked your game. You could have explained the double jump feature a bit better. The first block that's supposed to teach you feels a bit too close by, at first I thought that I just didn't time my movement well enough, unless I pressed space another time to see if there was a double jump. Something I did, only because I have a lot of experience with double jump mechanics. Someone who has no experience with platformers may have a lot more trouble with it than me.
Besides that the only other problem that I had was that it was very hard to get on that single small floating platform after the tunnel, and the few times that I did get up on there I didn't know how to continue onward. This might be communicated better.
All in all, I really liked the feel of your game. The character seemed to fly onward more than I'd expect at times, I got used to it quickly. You placed your platforms well in general. It never felt like I had to wait for my dash to return, If I had to use my dash I usually had to jump onto another platform without my dash before doing a jump with da dash. I think you did this really well!