I'm absolutely sure that there are no important differences. I own all three versions of the game, and I can do fine in all of them =). I prefer the Japanese version for the faster text, but it doesn't matter much.
I've been itching to play ZM lately so I started playing lastnight on GBP with a GBA SP for a controller. Then I decided to stop and try on emu for the first time. The gamepad makes it so much easier to wall jump, but IBJ isn't working right. I think it has something to do with a minor lag caused by video settings. Any ideas?
I have a PSP somewhere but have no GBA emu on it. That's definitely something to consider.
I really wish they would release ZM for download on the 3DS. I would love to play it on 3DS XL. I'm kind of puzzled as to why it's not available. I downloaded Fusion on 3DS and love playing that game on it.
I'm going to try my GBM next. You would think it would suck because it's so tiny, but I have small hands.
Only things I can think of is trying to get a weird-angled SS glitch-through, which I doubt would work, or completing items or triggers in a certain sequence/dodging gates that tricks the game into not spawning it/despawning it.
There's this one by dragonfangs. The HBJ section starts at 8:38
Can this be used to get to your ship (first time) by skipping the Power Grip? There's that one room below, one room left of the elevator going down, which has a flying dude, water, SS blocks, and a hanging structure that prevents DBJ, but it looks like HBJ might be able to pass it. I wasn't sure if HBJ was possible/didn't want to put in the time to practice it.