So called "shitpost" parody, low quality in graphics and audio.
Very stretched jokes about money and patreon (I mean, in which episode does it even say they want to get donated? It's in the Author's comment's, sure, but it's not all in your face during watching a movie, like all the youtubers want to "like&subscribe") and repeatedly used in the movie.
ADDED: And then I played that one episode about songs. Although still think they meant it as a joke, giving half star more for this.
It's an interesting point to ask: why a squirell? Perhaps it captures it's hatred and objectivity towards society a little better than any other human. I would suggest some different motive to that though - back in the Disney times the squirells talked too (Chip & Dale for instance), they had high pitched voice. The voice was produced mainly by speeding up what someone has said on cassette recorder. Since Foamy series are focused on LONG tirades nobody would probably want to stay to listen , the author decided to "FF" the whole spiel - and what is better than to mix it to make sense with the author's childhood liked characters.
Why Foamy likes coffee? Because who would be rambling more: someone who drinks coffee, or someone who sips tea :)?
The voice of the characters (pitch) would be ok as far as parody goes... but even if you wanted to point out that they talk really slow in comparisson to Foamy, you just made their lines unlikable... that with the slow talk makes it unbearable - and what's a good parody if it makes you hate it more than the original?
This is quarter-quality, does not gather much to make fun of from the original. (maybe beside the motion tween joke, but gotta say, still like their animation way more over this)
All in all, the jokes could have been made a tad more sensical an likeable, and there's alot of ways to pull it off, even if you do not want to relate to the series: a use of different animals, sex changes, crossover with something else, pixelating stuff has already been used but are still good ideas.