Just finished this game and it was really cool, satisfying, beautiful, relaxing, all the good stuff. You fly around in a paper airplane, collect stuff, unlock things, try to not hit the walls (or fly the plane straight into the ground, which i definitely never did), etc. Very much worth however many of your currency 8,19€ converts to.
Check it out here: https://store.steampowered.com/app/956140/Lifeslide/