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To get past the witch/goblin with the fork, you have to go in the second door, stand near the square until she/it gets right near you, then step on square and duck. Witch/goblin will be impaled.
Oh, and you can make it bug by very quickly exiting the wizard's room after he turns you into a snail - the music will change and you will be able to crawl through the hole, but the sprite of hero will remain and you'll still be able to attack.
Hm, I completed the game and now see that balance is not that great at all... All last levels are REALLY easy and completed just by spamming sentries with optimizer, fork and splash. tracer + 2 optimizers + fork + splash is even more deadly, but works not on all levels. Still, this is the best TD ever.
Oh weeeell... The game itself isn't so bad I thought. Fix the mute and make ammoless weapons scroll onto NEXT ones instead of previous ones (why do you get beamer anyway without any ammo?...) and I'll rate it 5/5
Great, so without exiting to the menu there's no way to turn off sound and music? The mute button has to be present at all times (or at least accessible through pause menu (or at least accessible through options through pause menu))