This has literally everything - bad palettes, cutoff, glitched graphics, bad usage of layer 3 tides, blatant level edits, with a couple of half decent levels sprinkled in. It's a hack moderator's dream. It's test.smc, except it hasn't been tested. There's nothing much I can say about a compilation of bad levels - it's meant to be terminally bad.
The glitch after the first castle intrigues me and is something I may or may not look into.