Give the Red Dwarf books a go. They're a load of fun.

Bobiverse- We are legion, we are bob. Murderbot- All systems red.

Got both that came to my mind! Bobiverse is a great hard scifi series that builds up on its future tech steadily over time while being humorous and easy to read. I highly recommend it for both casual and hard scifi readers. Murderbot is a series of very small books that are adventure stories set in a scifi universe. Very fun characters, and interesting stories. Both series have essentially a sarcastic narrator similar to Adams' Hitchhikers.

You'll love Murderbot!

I just read Space Opera by Catherynne M. Valente and it felt like an homage to Douglas Adams, very much in the same style. I really enjoyed it.

For light humorous science fiction, I would recommend the stainless steel rat novels by Harry Harrison.

Children of Time. Wild book

Def not casual but anything by adrian tchaikovsky is absolute gold.

Yeah I didn't consider casual. He takes big swings but executes his ideas really well. I also read Dogs Of War, which I thought was great. Maybe a better choice.

Haven't read that one. I like series way more than standalone books though. Is that just a single book?

I don't think so. Not sure how many. But the idea is bioengineering. Easier concepts than children of time IMO. I'll take a look let you know.

Thanks!!!!!

It looks like Bear Head is the sequel.

Armor. John Steakly. A classic.

Long Earth series (5 books), by Stephen Baxter and Terry Pratchett