My game unplayable on raspberry pi -- pi0

Here is my game Free Fall.

It runs the same way on my pygamer, my ovobot and in the emulator. But it doesn’t at all when I play it on my Raspberry Pi W running pi0.

This is a pretty simple game that isn’t meant to be too challenging. In fact, once you get the hang of it you can play it forever. However on pi0 my character almost always falls to the bottom of the screen before the first cloud. When I do get to hit the cloud he barely slows down. The game is over every time in the opening seconds.

Is this a known issue? Is there something wrong I am doing and/or is there something I can add to my code to adjust for this? Thank you so much!