Recreating Flappy Bird game

Just started using Arduino and I wanted to try to recreate this Flappy Bird game:

I don't own the same components, I have a 2.2" TFT screen in stead of the 1.8" which is used in the tutorial. I got everything working, but in the same 128x160 resolution (see 1.png). I changed a lot of variables, but then it doesn't work at all anymore (see 0.jpg).

Since I thought it would maybe be a memory issue, I switched over to an Arduino Mega (2560). Got it working in the original resolution, but still not able to scale it.

So my question: Is there any way I can easily scale it to fill the entire screen. I wouldn't mind it being in the same resolution, but stretched.

Flappy.5.ino (11.9 KB)