I dig the themes and visuals. After digging into puzzlemaker myself, I can appreciate the deviations you've worked into the base engine. One of the biggest I would suggest (and I'd probably say this about every puzzle maker game, and thusly is more a criticism of the engine itself) is having a unique filled-hole metatile (in this case probably a mound of fresh dirt over the grave). I know puzzle maker re-uses the same code for clearing collectibles and clearing holes- so that's a hurdle, but I think the graves/boxes and holes just disappearing is visually jarring.
Oh, and I really dig your 8x8 font in this. Chunky, quirky, and still heavily themed. That's not an easy task. :D
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Yeah there's really so much I can do there as far as changing up the filled holes. There may actually be something to work with in the recently updated engine but I haven't dug into it yet (it builds down to Mapper 2 instead of Mapper 0 so I would have to rewrite all of my engine hacks from scratch). I'm also considering making a sequel in NESMaker, someone built a Sokoban puzzle patch into the Zelda-like adventure module and I could do some wild stuff with that I'd imagine.
But yeah I'm also pretty obsessed with fonts. This one took months to fine-tune.