The start is tedious. I'm 20 minutes in but still bring back 3 blue crystals max because how weirdly wide they spawn. Been upgrading 'more resources' all this time. Bringing 3 crystals per run and the upgrade cost is 48.... could be some better formula maybe.
Also end fetch button is under the full screen button. Could be bigger or more accessable like on the middle of the screen or spacebar.
But other than that its pretty fun.