I would love to do that, although it’s a question of finding the time as it'd be a fair bit of work.
I did make one new level a few years ago, but it was so hard only me and a DOS speedrunner ever finished it as far as I know 😅
Did you try Poet’s Cosmo levels? I played some of those and they're fun and intricately designed but also very very hard https://www.poetsoftware.no/mods/cosmo/index.html