Ohhhh, nice spot indeed! That approach to the last level was not actually intended. It's more a case of blocking the bullets as a large amoeba and then quickly running through the maze before the bullets make it all the way through (I've posted a little walkthrough clip on the page now). But I'm glad you enjoyed! With more time, we'd have definitely added more feedback to say when you've died, undone and whatnot. And yupppp, the final room was just a flavour of another mechanic we'd might have wanted to add had we the time (like "lava" filling up a room, and having to burrow in and undo to avoid it).