boring, repetitive, too easy.
It's not bad, there just isn't much to the level design that separates this game from the thousands of other side scrolling games.
I was able to kill pretty much everything except the helicopters and tanks with a sword. When that got too boring I realized that I didn't have to worry about conserving ammo because it's constantly replenished.
I would like this a lot more if there were less, but significantly more challenging enemies, more boss fights, and a reason to collect all those random score items.