Day 1: Since I'm in transit all day, I'll have to settle for a microtask for today, I've added line selection in Left, it's something that I can already do in 3 keystrokes, but I use it enough that I've been wanting to be able to do it in one.
https://rabbits.srht.site/decadv/
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Day 2: If you'll allow me this one flex, I've implemented Conway's Game Of Life, in the Orca esolang, which itself is implemented in the Uxntal esolang.
https://rabbits.srht.site/decadv/
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Day 3: I was thinking about #langjam starting on the 14th, and I figured, since Rek and I have this game project coming up about the same time, it might be fun to do the whole thing in Lisp. So, I've implemented a little backend today, I'm only missing clojure bindings and the parser, which I've done a few implementations of before, so that should fall into place nicely for the start of the jam.

It's always fun to be reminded of how nicely it all maps to catlangs in comparison to algols.
https://rabbits.srht.site/decadv/
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Day 4: Finished the reader function for the Lisp I started yesterday. It's already capable of parsing and reducing some expressions, but I have yet to implement lambda and closure bindings, which I'll do tomorrow!

https://rabbits.srht.site/decadv/
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Day 5: Implemented a comfy little lisp called Heol that fits in a 2kb rom! It's designed to be usable with even the simpler emulators, like uxnmin.c and REPLs. It's missing I/O still, something for tomorrow.

Also, @vacuumbeef finished up the Game Of Life implementation in Orca and it's amazing: https://llllllll.co/t/orca-livecoding-tool/17689/2292

https://rabbits.srht.site/decadv/
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@neauoire Heol is mind-blowing, I would have expected Lisp to be much harder to implement on Uxn!
@soxfox42 I thought so as well, I'm still reeling thinking about how well it maps to it, I don't think I've fully understand what that means yet.