This is NOT a REVIEW. I give you 5 stars just because. This is a set of SUGGESTIONS on how to improve.

Artwork:
1) You should put more detail into static objects such as background and unanimated scene objects. Windows' glass reflects light and has frames. Walls are rarely just plain color, unless very well painted. So walls are made of bricks, which could be visible at some spots. Tables are wooden, and wooden items have natural patterns on their surface.

Animation:
1) Chin needs to move up-down when a character talks. Also his head may move a bit during speech when additional effort is put into certain words.
2) Sometimes people blink. Maybe there are people who never blink on public.
3) Characters are too static, doing nothing, making very limited movements or none at all. They should make more movements. Elbows should bend. That left coffee cup arm is too long.
4) The fat boy's poses switch lightning-fast. Need more inbetweening. It won't ruin the effect. Only improve. Or at least clothes should wave around after a fast movement was made.

What I found amazing is the amount and quality of different shots. All very good drawings and each deserves a unique place in Art Portal. wait, this is not a reivew...
From your anonymous fan

You should have went on with Mario about boobs and Batman and stuff.

Should have killed him by Hank walking around and slaughtering everyone in his sight

No matter how many times I tried I can't beat this. I'm just going to assume it is unbeatable and there's no ending. EDIT: Nvm I beat it. The ending brought a tear to my eye...

A tip to anyone struggling: just don't bother trying to dodge the final boss' attacks. They were not designed to be dodgeable or balanced in any way. Just farm max lvl, spam the Shield spell and Blaze. The Shield spell is the last one for a reason. When you run out of mana, just keep standing in his face spamming Blaze, you have the HP to tank. Only thing frustrating is how many times it took to figure out the best strat. Oh well.

Btw I tried hacking this and it seems it's in WebAssembly (I know you used GBStudio, but wasm is its output for the Web, most likely), and a thing like HP is either not in the Firefox process, or it's changing location in RAM, or it's encoded in some weird way - dunno, couldn't find it. Unhackable.

1) archers pick a target and keep attacking it until it's dead. Arrows do not strike the nearest enemy of archer, they strike only the archer's target. If the target moves out of archer's range, archer won't follow it and will keep shooting nowhere.
2) if I click on zombie (create a zombie) when the cursor is fire ball (when I selected to cast fireball, but didn't actually cast it and created a zombie instead), then the zombie is created, but the fire ball spell is cooled down as if I actually cast it.
3) if a succubus starts turning a unit, and the unit dies before succubuss finishes waving its hand, then succubus will stand on its place and keep waving the hand over and over until it picks another target. Then it becomes normal.

extraterrestrial

in the bad meaning of the word. It is slow, repetitive, it is out of melody, and plain because of only 2 voices, while the second voice rarely steps in.
It is kind of growing from the start to the end, so it does involve some acoustic benefits, but it's boring.

Ok good

I see how dark this piece of music sounds. It's very heavy and bad ass.
But how can you overlap rap text over electric guitar? What purpose would that serve?
And the rap text is complete mess. It doesn't even have a single rhyme.
Overall, I'm not a composer, but this track seems to me like a long road with rocks on it so as not to let anyone walk on it. It gets hard to listen to and repetitive after, like, 40 seconds of it. Good work though.

Deep sound

Oh when I listen to this I can already imagine some sort of game.
I mean, this could be very useful for games.
I liked how you managed to create a tension around 2:00
But how is it linked to All Good Things... ?