Are we sure we're all talking about the same game?
I love Aldynes too, but the game really does fall short in the color department.
Just to point some things out: Yes, the last level looks fantastic, but no other level comes close. The 3rd level is
pretty monochroma-ic, but the shading isn't constrast-y. Stage 4 is monochrom-ic as well, but the music is just so awesome that I give it a pass
Stage one, the whole thing including the Boss, lacks so much shading and is very contrast-ic. It looks border line Genesis/NES. The first Boss looks like NES shading (not gonna lie). Level 5 actually has some color, but almost no shades
and the colors they used looked straight out of an.. again NES title. Levels 2 and the last look the best. Level 6 looks OK, but the boss is awesome.
The coarseness of the shading (lack of it, contrast-y look), or the monochroma-ic look - it screams typical Genesis. Level 5 though.. I always thought it looked the worst; an embarrassment for what was supposed to be a superior system.
The enemies, bosses, weapons, and music pretty much make this game. Oh, and the last level too.