I think it's important to recognize that Jumper was the original final level in the first version of the game. When I first beat this level, it was after an update to GD Lite and was the final level there for a while too. I think this level is a great original final level, getting the most out of the game's core feature, jumping! It also throws a final insane twist that no prior level has done - upside down flying! I think it's quite remarkable for a final level to still be introducing new mechanics like that, tho it's likely Rob had always intended to keep adding more and more levels with new gimmicks from the beginning. Still though, jumper is a level that made me really impressed as a kid with how you could combine 2 previously introduced simple mechanics to make a new interesting one!

The gameplay is very fun. The jumps are spaced in ways that are require you to hone your reading ability, not just memorize. Gameplay that is fun and challenging to learn to sightread is my favorite!