Some things that stuck out to me are the pacing of scenes and jokes, I feel like a lot of the jokes could be cut down to keep things snappy. There are way too many instances of shots hanging or taking too long to really get going.
Additionally, the sound design felt somewhat hollow. A lot more environmental sound effects could be used for minor actions. More use of the music wouldn't hurt for dramatic moments, either. Personally, I like that the music is used less than EW Legacy, but it still led to some scenes feeling underwhelming despite the stakes.
The positives are pretty strong, though. The animation is very reminiscent of Edd's old style and the voice acting is pretty great. George doesn't sound exactly like Edd, but he has the same mannerisms and it really works. Ed Templar was also pretty good, I think in time most fans will come around to the new voice from the acting quality alone. He doesn't sound like Tom, but it's not like the performance is bad.
Overall, it's pretty good for a feature-length Eddisode and Matt has already proven himself with the shorter skits so I think the crew are just finding their feet still. I can see some really great stuff coming out of this era of Eddsworld.