Wow, thanks for playing and making a video! Genuinely a delight to watch somebody play it live. So glad you liked it and the art! This was really valuable to seeing how we pace the tutorial too - we put controls for the ladder in, but not next to the ladder. And also to fix some of the driving mechanics like the ditch! That's definitely a bug.
Right now as of 0.52, you can play for longer than 4 minutes but the cops arrive on an automated burglar alarm and you make less money. Previously we had a hard cutoff of 4 minutes that simply ended the map - we felt like this was a compromise between those who wanted to stealth through the whole thing and people who wanted to speed through. I think we'll continue tweaking this particular point more and more as we get more feedback.