Cool game! I like the idea of a shmuptroidvania game. The concept kinda reminds me of the Guardian Legend. As a controller guy, WASD controls are always awkward to me, but they're consistent and tight. I like the idea of a 360-degree shooting (or maybe 120 here, I guess) level-scrolling shmup. Would translate well to dual-stick controls. The graphics are solid, too. Looks like if Rare had been tasked with making an adventure/sci-fi title for the SNES (I mean this in a good way). I would have finished the demo, except I walked off the right side of the screen on the bottom level of the 3rd gas station and was trapped.
The shmupping is solid, I would focus on level/enemy design on the platformer part. I can say this is the only game that will challenge you to smack space sperm out of the air with a monkey wrench.