The Grim Reaper in Stage 6 is quite hard! Is it just two hits by him with full health and you die? Is there a ring or something similar in the game to increase defense?
Also, out of curiosity, what does the number mean under the key counter? I currently have "V" under it. I'd assume it was some type of upgrade, but I don't know what exactly. Also, is the magic sword (found in stage 6) good against anything? The shiny whip seems better always.
If you do an update to the game, I think I'd be cool to use an item pickup script so that players unfamiliar with what they just obtained would know what it was.