Bear was pretty cool, love the twist of some bosses you just don't touch, others you do, love the rain and the cryptic messages in each level, the scroll to the next level thing is a nice transition. Oh yeah, the controls were a nice dialog.

nice giving bobomb a spot here, can hardly see his groovin.

Bowser having his own adventure's pretty cool, this one's hard. I liked the concept, the dialogue / ending

coll guy was awesome, everything about it. I wish there were more zoomed in levels like the last one, and the plot twist / tie in at the end is strangely cool, or coll. That's a sprite for generations, and a hero that wears 3d glasses. Did I see a deep and spiritual sprite from wolfenstein? I might've. The way the music flows in this and later on knowing I could shoot with Z

Duky Attack is little scrolling mini game, not much to say about it. It looks like it could be expanded into something great. Nothing like the duck hunt duck getting revenge.

Zelda's Adventure is super tough, but I liked it. The effects and the way it just kinda flows. The blue ghost and magenta/red ghosts can be brutal though if they get into a pod that you need to get trippy smiley faces out of though.

That's all so far. If these are your first attempts at gamemaker, they're not bad. You advertise a good medium.