Unfortunately, it seems you missed a few things while updating the maps. For instance, some of the swamp water is still yellow.
I don't recall anything else as bad as this, but still might be worth going through the old content once more to see what still needs fixing.
Beyond that, this was a very good update. The emblems range from being obvious ones for idiots like me to find, to crafty lil buggers, to ones that can only be described as "delightfully devilish". That one at the end of Egg Fleet 3.5 was quite something. I very much appreciate that you made Green Hills unlockable with just 40 emblems instead of requiring all 45 from the campaign, since again some of them are just... geez.
Was Green Hills meant to be a troll? I saw the joke coming. Kinda wish we could have seen Donutlord in person rather than just his police car. Those bear traps are somewhat annoying since you can't really see them coming, maybe they should upright textures so they stand out a bit more. All in all, a solid 7/10, needed more Olive Garden.
like it's a ticking timebomb until all the current mods are obsolete trash again. ^^;
Obsolete as in "badly aged" or as in "nonfunctional"? If it's the latter, then I don't think you need to worry much. Unless the next big version wipes the slate clean, then there's a significant chance this mod will continue to work out-of-the-box. Many 2.1 level-only mods work flawlessly in 2.2.
Really, the only thing to watch out for is if the color palette is changed again.
That could get messy if all these textures are in the Doom format instead of being PNGs.
...is that a thing? Like, did the devs say that the next version of SRB2 is going to be 3.0 rather than 2.3? Because if so then... dang, son, I can only imagine how far the scope creep is gonna go. Not complaining tho!