I thought it was pretty good so far! I really liked the graphics too. I got about as far as the store and I had a couple thoughts:
-It's hard to determine what is in the background and what can be collided with. I didn't know I could crash into trees at first (even though it was said in the text), since they don't pop out enough from the background. Even once I knew, I occasionally forgot and crashed into them again because they did not seem to 'pop-out' like an obstacle. I had a similar probably with the balloons.
-I liked how the hud faded a bit when you moved over top, but the text didn't fade when I flew over the top and got in the way.
-I didn't like how I couldn't tell what I was buying at the store until it was already bought. Also, it seemed like the first slot at the store didn't even have any items.
-I liked how some of the different things you can abduct change the way you can shoot. I wished there was more of that though, the only one I could really tell was different was the corn.
Overall it was pretty fun! If I get a chance to play any farther, I'll post some more feedback. Good job!