Thanks so much for taking the time to write this up, it really means a lot, especially this early on!! :)
Yes, there's a way to practise, the regular mode (the PLAY button) doesn't spend any of your daily tries, so you can play it as much as you like and when your daily tries are gone in the special daily challenge, you can practice that map too but it doesn't count to the ranking score.
The first time you play, there's also a guided tutorial where I tried to explain every mechanic and event in the gameplay. It shows what a PERFECT is less about the angle and more about timing: the guide line in front of your ship changes colour as you orbit, and i fyou tap while it's gold, you skim the next planet's surface.
You've made me realise the start screen doesn't make any of this obvious, though, especially that PLAY is the place to "practise" (also to progress through the story). Also, a tiny illustration of an ordinary landing vs the PERFECT landing is a great idea.
Thank you again for the kind words and the thoughtful feedback!!