Next we have Size Matters, a Japanese game designed and drawn by Uru with translation by Alice-Magic.
You play as a legendary hero in a fantasy land that is suddenly destroyed by the giantess Demon King. The hero then teams up with a goddess to go into the Demon World, a gigantic modern-day city where the two of them are like ants, to find a powerful artifact.
There are some light RPG elements reminiscent of Shrink High, but they're mostly there to convey how powerless you are against the girls of the Demon World. The core gameplay is based around exploration as you find yourself at a school for - you guessed it - giant demon schoolgirls.
I shied away from it with the pictures here, but there is a lot of gore in the game - as you might expect from Uru. There is a preferences setting that lets you turn off the more extreme gore (as well as some futanari content), but if you aren't cool with death and blood, this one definitely ain't for you.
If you want to check it out, you can download version 0.5 here.