this feels less like a demo and more like a proof of concept, honestly. i recall you saying that you had hard drive issues somewhere along the line and this isn't at the best it could've been, so i won't dock points for what isn't here. but what is here?
it's one act (i'm not counting act 2 or the tutorial, since the former is just a boss against the egg mobile and the latter is a tutorial similar to the already included base game version), and in that act is a total of three rooms. not that that's a bad thing by any means, greenflower act 1 has two rooms if you think about it, but what greenflower excels in is memorable setpieces and things to do and see in those rooms. this...really isn't either of those. it's mostly a straightforward shot to the goal, with a few empty cliffs and edges and optional islands that you can reach if you're a fucking natural at crawla bouncing holy fuc
the rooms themselves also don't look that great. despite being quite wide, they're enclosed as opposed to being open islands (which i assume is the intention here? i mean it's a tropical aesthetic so), which results in the entire thing feeling very cramped because of the massive walls that just end. they're also surprisingly bland, without a ton of texture variation. i'd recommend adding additional ledges or cliffs cutting into those walls that have different textures on them, just to break up the visual monotony. the last room is nice, though, even though it's disappointingly short.
as for the raw gameplay, it's very, very bland. most of the stage is running up slopes (some of which are way too steep) and either jumping off or running into a diagonal spring (which should be put on VISUALLY DISTINCT SECTORS. PLEASE. i don't intend to be rude with this one at all but having the springs rest by themselves on the slopes can make it very difficult to aim for them, especially with how small they are. even adding a small pillar sector like greenflower 2 does would go a long way and break up some of the texture monotony). this repeats for another two rooms and the stage ends, which is immensely disappointing, because that's all there is. there aren't any alternate pathways, hidden secrets (aside from the aforementioned islands) or gameplay gimmicks, it's just a stage where you run up flat slopes.
i do apologise if this comes off as rude at all, i do think you're a talented mapper, but this just isn't it, honestly. i know you set yourself a deadline for this demo release (which is both weird and stupid for a mod for a fangame) and i think the fact that you missed the deadline by a couple days and had only this much to show for it is a sign that you should Stop Doing That. don't set yourself deadlines you're not able to keep, just make something you're proud of and release it when it's ready. the community says a mod will release "When It's Done™" for a *very* good reason.