Hi Coolcrab! Looks like a fun two player game. I'd love to play it on our show ZeroPage Homebrew but it's a little too jittery on real hardware at the moment. I recorded a short video of it playing on my VCS.
The line count for the game seems to jump in the range from 262-276. It jumps to 264 when the screen scrolls down and a big jump to 271 lines when a piece of the tree disappears off the bottom of the screen. You can check out your line count in Stella by pressing ALT-L (on windows). You can analyze it frame by frame by jumping into Debugger mode (~ on Windows) and clicking 'Frame +1' over and over to see it in action.
Also, as you can see in the video I noticed you can get six powerups in a very short amount of time by going right to the top of the tree.
Other that that, keep up the good work. Looking forward to updates!