Way better than the original game released under a tight deadline!
Adding sounds made it complete. You chose most of the sounds very well, fitting the action and effect they were recreating.
Some of the jumps are still pinpoint, but most of them are fairly jumpable. The checkpoint system is a good add! I liked the star particles too.
The boss seemed a bit too hard to defeat (so many lights), but maybe it's intended to be this hard.
Good job on the post-jam corrections! Check out my updates on TheJoker when you have the time :)