Thanks a lot for the feedback. I might add some new levels whenever I find some time. I'm currently in the middle of an exam session.
Regarding the placement, I thought carefully about that and I'm still not sure. I ended up allowing to move where you want so you can play around to find new interesting trajectories and have more fun overall. But I like your idea of fixed launch pads, I might add levels with constraints to see how it goes.
Thanks for liking the game, I appreciate it a lot :)