Is there a particular reason I can't resize the window? Or is my computer just being weird?
The game can't be resized because it's pixelated - resizing it make the game look extremely chunky and weird.
If the game is too big, you can press F1 to set to the scaling to 1:1 instead of the usual 2:2.
It was actually way too small, but the 2:2 scaling is perfect, thanks!