Thanks! Figuring out screen size is always a nightmare for me, and with this game the art wasn't really scaleable for different aspect ratios. I figured a too-tiny screen wasn't such a bad problem for a jam game, not worth the effort to fiddle with it :P
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I actually had the exact same issue. Mine was made in 320x240, then the window scales itself up to the player's current resolution while maintaining aspect ratio. Annoyingly I discovered after it was released that for people playing at 1920x1200 that mean their taskbar blocks the bottom of the screen. Your way was probably safer :P