Heh... why does the dog on the cover look like a sock)?
Imagination Land - Cute! Nice opening to the soundtrack! CUTE
Life Attacks - OH I'M SCARED... Good... The guitar has a lot of “dirt” to it. You can either turn it down on its own, or try to pick less dirty effects on it. At the breakdown point on the drums, the toms are too overdriven. Try reducing their low frequencies in the EQ. Allocate each instrument its own positions in the EQ, because the guitar takes up a lot of space and the synthesizer is hard to hear. You have an interesting idea! But try to learn more about the technical side of sound quality (I'm telling you this as a person who has very strong problems with mixing).
I Remember - Heh... and now it's cute and calm again.)
Overall - you have a good idea (I like the idea of the game). The only thing I can advise you is to watch/read guides, make more music about MUST actively participate in such music contests.
I'm sure you will do well! Good luck!
P.S. Sorry if my comment looks very rude and harsh. English is not my first language, lol