1@version n: Linux binary doesn't work because it's not statically linked and the necessary .so files are not included. Try again.

2In my case the main character has boots of iron and the easier difficulty level is harder than the supposedly hard difficulty. Also, when you change the difficulty level, you can hold the enter or space key and it changes like crazy. In a few cases there are floors you can't reach.

4The guy floats, runs like a maniac, and can skip jump like crazy. The sprites are a bit small, and the background looks like a stereogram...