Job Offer - Programmer [PAID] Make game independent of fps



I have a game that needs to work the same on all devices, slow and fast.

The game is called Flappy Cat and can be downloaded on Google Play.

The code isn't perfect structured, so it can be a little bit hard to find your way around the code. But this is a small simple game, so it shouldn't take that long.

I use the variables 'hspeed', 'vspeed', 'gravity', 'x' and 'y'. All these need to be tweaked so they'll work the same on slow and fast devices. I have tried using delta time but just can't figure it out.
How you solve this issue doesn't matter, just as long it works the same.

Payment is done via PayPal. We can discuss the price.