It typically defaults to your screen resolution but you may be able to force it lower in graphics settings on windows, or by temporarily lowering your computer's resolution then loading it. Sorry about that.
Yeah a lot of that is down to us using Unreal 4, a pretty heavy engine, for a fairly simplistic game. Glad you enjoyed it anyways. Consider giving Once Upon a Crime in the West a chance, our follow up game, also included in the bundle.