This isn't all that great
The guys are kinda hard to hit, the soundtrack gets really annoying, the bullets are fired in groups of 2 but only one goes off, you used one of those "pre-loaders in a box" (I used one of these myself, but only when I was just starting out... this was the daily feature), and basically it's the same exact thing except a bit harder with each progressing level. It gets boring real fast.