Really enjoyable! I caught a bit of this game on a stream and had to try it out.
I would say the difficulty was fair, I would've actually liked the levels to get a little harder but I've played a lot of games with lunar lander style controls and I imagine that would come in future levels! I found myself mostly using my peripheral vision to track Juan while I focused mostly on the mouse/platform movement, which seems backwards from what I was expecting, but worked well for me.
I also found myself flinging Juan with the platform and that saved a ton of jetpack fuel.
The only gameplay thing that felt a little "off" to me was how slippery Juan is on the platform when moving it left to right. I'd prefer to have him remain pretty firmly stuck to the platform unless flinging him.
The level with the 3 horizontal lasers was especially fun. I'm curious to see what new mechanics you could come up with if you continued work on this. The platform control is perfect with the mouse and there's something really fun (imo) about only having binary control of a thruster.
Also you made a game that feels very complete and fleshed out, with good visuals and sound effects, which is always a challenge in a jam!
Maybe later levels could have penalty for touching the platform to the walls too, to add to the anxiety.