Insector X on the Genesis is a port of a Taito arcade game (which is also available on Taito Legends 2) that has had a few alterations that were in my opinion for the better. It is a horizontally scrolling shooter in which an insect-sized hero blasts his way through waves of cyborg bugs in order defeat their queen and save the invertebrate world. Each level ends with a giant bug boss fight, though the stages are often split between an exterior portion and an interior finale.
The powerup system is pretty basic, but has a couple of highlights. You power up your gun, increase your speed, and pick up the odd bomb or extra life. However, you also get two other secondary weapons; a red bug weapon that shoots forward in a dual wave pattern and a blue bomb that arcs out just in front of you before dropping straight down. You can switch between both on the fly for situational use, and both have unlimited ammunition. You do lose all of your powerups upon dying, though, so you'll want to be sure to use them liberally.
Death in Insector X moves you back to a checkpoint, so you have to be sure to clear your passages and boss fights cleanly, which is most of the challenge is derived. Still, it's quite fair, and you don't die by touching walls, making maneuvering much more comfortable. This is good, as you're usually in tight spaces in the interior areas, and your sprite is a rather large target.
Speaking of sprites, that's where the biggest changes from the arcade occur. The original game is much more a cute 'em up, full of cartoony, big-eyed bugs that look like they jumped off of the pages of a children's book, and your hero looks plain goofy. On the Genesis, everything is given a sci-fi overhaul that in my opinion really works in its favor. Instead of popping away at a big cartoon bee that's just begging for Bonk to headbutt it, you fight a huge biomechanical monstrosity that looks like it actually means to kill you. Your hero also takes on more realistic porportions, and looks far cooler in his metallic exoskeleton on Sega's machine.
The pace is good, the control is spot on, and the levels and enemies work together to tell the story of the brave little hero cohesively. Insector X is one of the better horizontal shooters on the Genesis, and I believe it outshines its arcade parent.
Played it?