Thanks for the video PHI, it's really appreciated!
One or two game-overs you've had were indeed due to a bug. String comparison can be tricky sometimes, I'll investigate that.
About the three people credited for the background : I just realized Luis Zuno and ansimuv are the same person. The main background is cc0 and the grass strip (which I recolored) is from another asset (CC BY 4.0). I found these assets here on itch.io. Stingray is an artist that is actively collaborating on the project as part of the team. He modified the clouds from the original background and did the title screen.