For some reason I couldn't see the bottom and left/right corners of the screen... I played through the whole game without being able to see the batteries, boss health, hearts and powerups. I only discovered this when playing it on maxgames :s
But still, it is an epicly awesome game.
Here's a guide for the achievements that aren't really explained in the walkthrough:
36-40: Go max speed on the wheel, then release arrowkeys and you'll spin. 5 times in a row gets the achievements
128: Click anywhere on screen
153-163: When all floors are flooded, undiscovered hidey holes will show up as white squares. Also, there are generally 2 on each floor.
192: Click elephant
193: Left-click and select Don't click here
204-213: OPen another window with the same game. Go on top of coffee mug, then jump of the screen to the left and you'll discover cold coffee. stand on the straw then close the window :)
221: Press space
What??? I died on level 10 (the first boss fight). I think that shortly after I died the boss died.. And then I was given the ending of the game? Weird.
To avoid the snakes and escape, when you're in the room before the snakes (where it says well done, trophy in next room blablabla) Go a bit forward, and then back again. You'll find another door :3