Tip: A common level trope to avoid is "item babysitting". This involves forcing the player to carry P-Switches, springboards, or other items all around the level. Usually, this doesn't end up being very fun or engaging, so use another level gimmick if you can.
There's some old collab hacks that's aged decently, but then there's some that's aged terribly and this hack is a good example. I hear from a lot of people saying that this hack is good for watching someone else play instead of actually playing it yourself. You can't really blame those people because of how much issues this hack suffers with. Some issues include lack of a difficulty curve, very complex and labyrinth puzzles, tons of item babysitting, levels that overstay their welcome, excessive precision required, and janky custom bosses. Keep in mind that those are just SOME issues. Because of how much levels suffer with these flaws, there's more bad than good in this hack.
Funny thing, some levels here were actually some of the creator's first levels that they've made. I suppose that explains the quality of this hack then.
This does have highlights, but they aren't worth the struggle. Playing this is not a thing I would recommend.
@Super Maks 64
I just ran into that problem myself while trying to co-op play this with someone else. He was player 2 (Iris), and complained about being unable to spin jump, and was wondering if his controller was malfunctioning. But no, it's some weird glitch in this hack that prevents Iris from spin jumping properly. How did that manage to get screwed up? And, is there a fix for this?
I don't know, it also happens in the original, for some reason you can press A on the 1st controller to start the spinjump and hold A ob the 2nd one to make the spinjump go high. This applies to every usage of the A button.
It's ASMT, not much there is to say about it. It's no secret that this hack hasn't aged very well at all. I kind of wished you had made some edits to make this bearable to play toolless (adding more midpoints to certain levels would've sufficed), but I can see why you'd want to preserve the game's original state.
Glad you submitted this. We can always use more fixed accurate hacks.
Can confirm that permission was given for this.
For the record, updates for hacks with the "fixme" tag typically don't require permission from the hack author as long as they contain only the fixes necessary to make the hack work on accurate emulators and hardware. This update contains quite a few changes in addition to its accuracy updates, thus it required permission to submit.