Really cute little game!
I enjoyed the opening cutscene, and the end was rather silly.
Classic Zelda-esque dungeon exploring, which is always a good time when done well, which is certainly true here.
I liked the use of the umbrella as a weapon, reminds me of a game idea I had a while back that also had an umbrella as a main weapon... maybe I should actually get around to making that someday. But I digress!
I enjoyed using it as a shield to slowly close the gap between enemies, and having one be out on the ground deflecting shots was a good tell for those who hadn't made the connection already.
I liked seeing all the ghosts together at the end, and that to them we were just kinda hanging out and playing together, or at least that's how I interpreted it...which makes me feel better about accidentally stabbing the one that upgraded my umbrella earlier, sorry about that!
Only thing it's really missing is some music, but other than that it feels pretty complete!
Nice work!