Wow, I'm glad I found this game! How great is it! I encourage everyone to at least give it a go!
I will explain my experience so far, in case it helps anyone else: At first I was using an old WHDLoad version (it was 1.1) and the controls were not responding properly at all. I was constantly jumping and could not press down on the joystick to stay as a 'puddle' without the game reverting straight back to being 'inflated'. At first I thought this was just the game, being the first time I had played it. I realised something was wrong when I went to put in my high score (which was terrible of course!), and the keys were automatically scrolling through the alphabet (like the joystick control was stuck in the up position!). I searched around on the net and found information about a high score fix in later versions of WHDLoad (I think), so I re-downloaded the WHD Install, the ADF files from the developer's site, and installed back on my A1200. It fixed the issues, and immediately I was able to play the game properly and found this to be now one of my favourite games on the Amiga!
I played a few levels, and made a few silly mistakes leading to falling off the level, so I am sure I can do better, if I get the time, but here is my score:
17,690
Played on my Amiga 1200 starting on level 1, no passwords/keys used, and did not press 'Help' to advance through any levels.