One hasn't received an updated for one year, and the other since 2012, probably they won't work out of the box (The downside of move fast, break things).
hcorionnimgame is deprecated since sdl2 came out. I just updated it to support Nim v0.14.2 and you could use it as a kind of reference though, but I plan to create sdl2-based engine in the future, when I'll get time for this.
I haven't dabbled in game programming since the 90s, but a quick look at the list of available enginesshows many choices. I hope the Nim game dev ecosystem picks a good Copyfree-licensedC/C++ library (not zlib, etc)to focus on and makes good bindings. Godotseems to be a very strong contender.
Libman, I was actually looking for some mostly straight (SDL2, SFML etc. is OK) nim game engine, not using a pre-built engine. Vladar, I can't wait! I'll be checking the forums!