Sizer doesn't even work on this game, it stays the same size while the window expands. You'll probably have to use something like a zoom tool to enlarge the screen.
Also, this game isn't fully scripted for a pure run, as in even if you selected the avoidance option most dialogues still continue as if you've chosen the other. Thankfully, there aren't many bugs since there aren't even much gameplay yet. Also I absolutely enjoy one shotting monsters. It's been a while since I played an RPG game where I oneshot monsters from the beginning.