Thanks to everyone for the feedback! Here are some thoughts regarding the points stated above.
If at all possible, I would do away with the save points and have death zap you back no more than one screen, and if you have an extended sequence that you want the player to do in one go, make that an exception rather than the rule. Another alternative, if the Save points are just part of the retro experience, perhaps delay the respawn of the hazards a bit, so I don't have to go through three screens of stuff I've already figured out while I'm puzzling my way through the fourth.
I would prefer to keep the save points, and I think the approach you mentioned would be possible. However, most likely this would require that every screen be aware of what hazards it contains and which save point the player had progressed from, which is a fairly large-scale change to implement and verify. I can't guarantee it will be in the next update but am interested in a more forgiving save mechanism if it enhances the game experience. I'll look into other possibilities on my end as well.
This game definitely nails the classic Mac aesthetic. I chose the black and white version for maximum faithfulness. I would have preferred to have a nearest neighbor filter in full screen mode instead of a linear one... I'm not sure if Game Maker Studio can do that though?
I noticed that also, but unfortunately I couldn't find any combination of settings that would produce a correct-looking fullscreen presentation.
The only bit I really didn't like was having to walk through the mountains to dodge the lone robot to the east of the monk. There was no visual cue for which ones I could walk through, and no clear indication that I already had everything I needed to solve the puzzle... Maybe a different ground tile in front of the places you can walk over would be an appropriate subtle hint?
I felt a little ambivalent about this puzzle, since it requires more lateral thinking and doesn't really match up with the other puzzles present in the game. However, I would like to keep it in, so probably I would put a small flower patch in front of the entrance and exit as an indicator.
I do have other games that you can view on that page, but in general they're a bit rougher than this one. I am trying to find a way to spin one of them (Oneiro) for niche consumption, though.