I know you want Mysterious Islandz to be a difficult game, but Level 2 is too difficult for a level this early in the game - especially if you intend to make MI as long as you've planned. Level 1 is a reasonable difficulty for a hard game, but the difficulty curve takes quite a drastic spike upwards in Level 2. As I recall, having to toss around Ice Blocks is especially annoying.

I was going to replay Levels 1 and 2 and give you more detailed feedback, but the current version posted on the NCFC booth doesn't run on my computer. Right after the game loads, I receive an error about defining an external function. I didn't have this problem with the version I played on August 25.

I really like these Homing Bills. Just don't overuse them.

Well, as it is, it looks to me like there's a loose brick resting in a shallow pit in the ground, rather than a brick that's embedded in the dirt. But that might be the effect you're going for. It's not a huge deal either way.

Also, the skulls don't look much like human skulls, unless they're wearing some kind of funeral mask. Again, if that's the intended effect, don't worry about it.