I found the game to be a real challenge, which seems hard to find these days. For $2, you'll be getting a retro game that you probably won't be able to beat too quickly (unless you're some kind of pro).
Kid Vector is the kind of game we need more of. It's fueled by a love of the genre and a desire to have fun. It doesn't attempt to cash in on what's popular at the moment or be a clone. It does its own thing, and it does it with pizazz.