I'm glad you're enjoying it! I'm really pleased that so many people have been interested in such a niche game.
I'm not planning any additional stories in the world of kiwen kon, but I do have (very rough) plans for a second Playdate Pulp game (completely unconnected to this one), which I plan to make available in English and Toki Pona (Latin and SP) from the start. No idea when it'll be released, but it will almost certainly be free.
I do have a browser game that's playable in Toki Pona: https://billsmugs.itch.io/late-for-school - it's not available on Playdate, but should work in any browser (including phones). It's shorter and much more linear than kiwen kon though.