It ain't terrible, I've seen worse.
But, as far as content goes, this is completely unoriginal. An entirely interchangable plot, to characters who already have stories attached to them, dragged into a situation that's been told, (and told in this format) time and time again.
It goes double for the Axem Rangers; Alvin-Earthworm took from something that's already been done, and created them for his flashes, and you took from him, so those guys have been triple, or maybe even quadruple filtered through the originality spectrum.
While Brolly is a decent antagonist, look into his lore, and look into the Axem's lore. Brolly destroyed whole planets, with greater ease than even Frieza. The only reason Goku, Vegeta, and Gohan survived was because they were the strongest on earth...and even then, they only just BARELY got away.
With that said, what defeated the Axem Rangers (Mecha Sonic) is established to NOT be that powerful at the time he killed ALL FIVE (not just two)...so if this is a prequel of events, and the Axem's will clearly survive, it doesn't add up.
But we could get into how "your version of Brolly is different" or "this is my version of the Axem's, it's totally not linked to Alvin-Earthworm's Axems" all day. The point is, these characters have been done. This story has been told. These fights have been fought....and if you've been paying attention, these were all done years ago, and with fewer grammatical errors.
As an animator you're trying to tell a story, with content. This content is stale...and by being a storyteller, you're showing us the extra-ordinary happening within the ordinary.
This flash is the ordinary happening in the extra-ordinary. It just doesn't work. Give us, the audience, something new.