Really cool submission! Great job!

I like the idea, but as other have stated, when falling into a hole you get stuck in the falling state and cannot mutate jump out so you have to restart.

I like the concept of mutation being both good and bad

Please check out zombie cannon if you get the chance

fell into a hole, the floor collision did not work, the character got stuck on the jump image and stopped jumping. fake Mario and even the music resembles one of the rounds

Congratulations on submitting! It was a little confusing at first and there's a bug where when you fall in a hole sometimes you cant jump. Great work getting it in before the deadline!

don't go behind, you get softlocked

Some bugs, and the player feels pretty heavy, but overall, a neat game! Nice work!

After some troubles learning about the controls i managed to complete the game.
Interpreting the keyword mutation as some sort of "life juice" is an interesting Idea I didn't think of at all. 
Mechanically the game works fine, though i would suppose making the mutated jump a "charged jump", reducing the key bind amount. Neither felt the speed boost easy to grasp, but I cant come up with a better solution on the spot.
Artistically the game embraces a 8-bit pixel art style together with a simple track, doodling in the background.
I can't say I love this game, due to it's fiddley controls, but what I can say is that there have been games way more scuffed and being a game developed in this short amount of time by seemingly one person the result is quite decent.

I'm not sure how the game works. Couldn't use "S" and got stuck in a hole.