For the first non-sonic related SAGE game i've played, it's really fun (if you couldn't tell lmao). The sprite work is very smooth, expressive and it's just beautiful! The game is really good-looking, especially the third stage. Crash plays pretty well and the level design for his levels is also pretty good. Coco's stages aren't as good, but they're still really fun. (What I mean by not as good is mostly stuff like the Big TNT, which first-timers will most likely be confused by, thus costing them a few lives. Also I died because when landing Coco would suddenly go backwards, despite me holding right. It doesn't mean she's not good, it's just that she needs some improvement.) The music is really good, too. Overall, for a demo (and a non-sonic related game at SAGE) this is pretty good. Keep up the good work!
Edit: sorry i'm an ignorant piece of shit and didn't read the crate guide at all. At this point my only issue with the Coco stages is the reverse glitch.