I can't believe this game is almost 10 years old. I've always wanted to remake it using all the knowledge I gained from the past decade.
All the bonus levels explore different mechanics that could be in expansions, but I really would need to rebuild the game from the ground up because the code base is so bad 😅 It was my first game after all.
The game does have achievements! But only on Steam. It sounds like you've gotten most of them. The speedrun achievement is for beating it in under 35 minutes. There is another speedrun achievement for beating the game by rotating less than 225,000 degrees, which is 625 turns :)
Not sure if there is a way to send DMs, but I'd be happy to give you a Steam key for the game. I don't think progress is saved though? You can email me at tallbeard@tallbeardstudios.com