Thank you, appreciate the feedback! The game is definitely clunky on phones, and there is not much in terms of onboarding besides the "How to play".
There are no retries, the game is structured as a 3 x 5 level run, with meta progress unlocked between runs (like a roguelike), and I certainly take your point that it is not sufficiently well explained. I aimed for it being progressively discoverable, and without tutorial boxes, but that might very well be something to change!