I really like your concept and ideas of the animation, It can be a really great popular educational children action story, if it can be made into a series. The art style is not bad but the drawings and designs can improve, since some of the character seem to be designed like the old century fashion heroes, hero games and commonly seen children insect heroes, which makes it bland and does not stand out too much, not trying to say it's bad though, just saying the character design have the potential to be improved and made cooler. The animation is really cool and fluidly animated, but parts still need improvements, like the part where the movement of cola towards apple seems legit and slow ( it has nothing to do with his floating neckless head though or maybe it is. :/ )
Secondly, what I really want to say next and the biggest flaw of the animation is that, even though I know that you want to show all the characters and villains in the trailer, but this is a trailer and not a series yet, there is a lot of ways to do trailers and I have seen a lot of trailer but instead, you spoilt a lot of of the parts of the story, by showing a lot of the villains in it (it is better for the audience to not know too much of the enemies or their attacks until the very end or else the viewers will know what to expect when the series does come out, which will make it less exciting) For example, like you can already know Ice cream is going to lose when chilli shows up,
and of course, you also cut off every single part the blood pumping and exciting battles halfway, which is very anti climatic for both a story and a trailer (while the main purpose of trailers are to promote the main series and be exciting) and you shouldn't have shown the main character reaching the final stage already to meet the boss (which you are not going to show the boss's face anyway but this tells us that ''oh the main character seems to be able clear and defeat every enemies 'easily and fast' and is going to reach the end anyway" and if your reason is because you need to show evil pear, you should show her somewhere else, like how you showed the evil watermelon and showing a "so called" ending already in your trailer is like ending your story already without even starting to tell a story properly yet.
Even though, overall I liked your concept and animation, I still think you should not have put in your so called "whole summarized story" into a short trailer, which I really thought it is going to be a full story animation at first and later to found out that it's just a trailer. A story and a series is good and better when the audience have something to expect in the story. Which gave me an impression that you are not good at doing trailers even though you might be good at story telling and makes me think that you are quite ambitious too. Also since you already spoilt some parts of your story, it can also put a lot of unnecessary stress and pressure on yourself to create something new and unexpected in your story that is different from what you have already shown in your trailer to add in the story. (unless you are thinking of showing the same thing in your trailer twice again in your series). And make it better than what you have already shown in your trailer. (unless the viewers will feel bored easily and the story can become bland) For example, like you might need to think of how ice cream the villain is going to retaliate when she is already in serious disadvantage and of course new enemies (which I think you can't, since you already shown most of them). After all, everyone knows that it's no fun watching the hero win and crush the enemy easily anyway and straightforward too. (Unless, you are trying tell a bedtime fairytale story to a 7 year old kid which is not)
Oh well, what done is done, but it still got a lot of positive reviews and expectations as due to having good concept and ides and a lot of initial but spoilt excitement too, it can still be a good classic children adventure story too. Also I really liked your ideas and concepts, and I really wish to see it improve and get better and not just being forgotten afterwards like many other animations, after the trailer without making a better success than it. In sites like newgrounds and youtube, a lot of people these days would tend to be critically simple than me and just say they don't like it or hate it without giving further reviews. (maybe they are just lazy or do not know how to give descriptions or explain why and rate through emotions and feelings).Which also goes to show how much I like the animation and want it to get better.