Here’s another short level I thought was cool. Ciolf’s Deja Verdigris is built around the idea of repeating the same rooms over and over again, adding some small thing to it with each iteration.
It’s tough, but not just for the sake of being tough – here the build up of difficulty across the loops is integral to the concept, setting you up for a final difficult challenge that you’ve been preparing for. Having multiple loops starting from scratch also results in the level having a really nice rollercoaster difficulty curve – something that can be hard to do well, and works great here.
To play a VVVVVV player level, extract the .vvvvvv file into your VVVVVV levels folder. On windows, that should be in My Documents/VVVVVV, on Mac it’s Documents/VVVVVV, on Linux it’s ~/.vvvvvv