almightylordbob doesn't suck I can see what he means by dying really fast. Some of the enemies can hit really fast making it hard to hit them and thus you dying quickly.
Dude the music for the levels before you fight the bosses is a remix of the first starfox game for the SNES! The music is from the Cornaira level! That's pretty cool!
To kill the math teacher you have to throw 3 rocks at the board holding the AC then hit the alarm that looks like a light then when the teacher is in the right position under the AC throw a 4th rock at the board holding it. Note that the teacher will stop past the AC so you'll have to hit him when he's moving.
one other thing the ability to fly kinda makes it a little too easy. maybe you should add a stamina gauge or something that either recharges over time or when you eat stuff and it recharges the amount based on size.
There's a little bug. If you choose to make your worm bigger he seems to move in a circle a little bit when you're under ground. What I mean is that you hold down the right key to make him go up well even if you take your finger off of it he will briefly continue to move in that direction. I hope I helped.
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The flying stamina idea would be interesting, next game.