Absolute joy of an entry. This feels like a loving remaster of an Amiga / early DOS trendsetter. Great work with sprites for the protagonist! Level design is top notch for the most part, although it gets a bit tough to navigate without a map, especially when all the areas are very similar. Some very unforgiving jumps at times, and I'd reconsider taking damage as a necessity for progress. I got to the very end, but I didn't want to backtrack through the entire game to find my two missing hearts. Perhaps I will go back and try again in the future. Keep up the good work!
EDIT: Not only did you make a complete game, but adding a dedicated speedrun mode is absolutely going above and beyond what I expect from a jam entry. Kudos for that.