It's pretty good, actually. The music is not that good and needs a mute. It could also use some more theme and 'polish' such as using characters instead of balls and making the theme make more sense, and making the menus layer properly. Still, extremely good for a first game.
Playable, but not particularly fun. I liked the animation on the invaders. I'm not going to be surprised if I hear it was stolen as it doesn't match the rest of the game, though.
Performance is poor, as the ghosts just teleport around randomly. I'd recommend losing the Pacman theme, as it really isn't Pacman inspired and is probably IP infringement.
Starting with the chopper dropping at match speed isn't very fun. Needs to start with a few seconds of flying straight, maybe a hint that the space bar does something.