Yeah, it's a known issue with some setups. Try turning of v-sync and if that doesn't work try switching your monitor refresh rate to 60 hz. If you're using a monitor with some form a smart sync tech you may need to turn that off. Shoot me an email at support at spookysquid dot com if that doesn't work!
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Thanks, turning v-synch off did the trick and I was able to finish the game. Awesome stuff!