Adding checkpoints really eased most of the frustration out of losing, thanks a bunch for adding them!
That platform with the burger on it in stage 1 was insanely tricky to get over and made for roughly 90% of my deaths, I'm glad it was re-worked. Stage 2 has some weirdness with the enemies you can't really see until you jump, but it's not really a big deal since the stage is short and you don't start all the way over anymore. And, of course, the new art is a very nice addition too.
Very nice touches and lots of improvement since the release. IMO the biggest improvement at this point would be making it into a full game : )