You did a lot with the default Chex textures, I was surprised at how good some of the detailing was with the textures. Have you considered adding more custom textures? Usually here when people create custom textures we're all allowed to use them.
A lot of the Flembranes were constricted in terms of the space they were given, and as a result they couldn't shoot at me. I'd reconsider placing them in tight spots.
One of my main complaints is the flow of the map. It's a large map, and there's no problem with that, but I felt like it didn't flow well. As in, I felt like I was aimlessly wandering around shooting anything I came into contact with, but in the end I didn't know where I was going or what I was doing. Because the map is so free-flowing, it didn't feel like I was making any progression. I mean, 1 hour in and I only have one key? I felt like I missed something. I wouldn't want you to change anything just for my sake, it's a good map, but if after an hour I don't feel like I'm getting anywhere it's a problem, and that's what gets people bored.
I'd recommend making up a backstory for the map, that's always fun and it lets players know what they're trying to accomplish! Something I noticed was in the large outdoor area, after completing a section of the map one of the Spyro towers would unveil.. something. I didn't really know what that meant so making up some sort of story or scenario could help with that.
If you do make any more maps of this size, I'd recommend trying to keep maximum playing time at 30 mins. It drags on a bit after that threshold.
Overall, I liked it. I got stuck trying to figure out how to get into the 4th area in the large outdoor section, the one protected in both directions by a short COMPBLUE barrier. Any hints would be appreciated