So, this was a fun game, I had to do it on Easy after failing hard a few times on whatever is the default setting, made it to Round 4 with 5850 points.
The controls were my biggest issue, and honestly, I'm not sure if anything could get done. My coordination just wasn't having it LOL!
I think you did very well by limiting your scope and adding all the nice "juice" to the game.
Good luck!