Yep, CtC runs on DNH v0.12m and the latter three issues are standard for recent systems, unfortunately.
I think it's interesting that it's licensed as CC. Also notable that the assets are licensed for non-commercial purposes only, but the scripts are not.
It's cool that the game is now legally available for free, but this feels more like an archival than an actual sort of release. Additionally, if you had the game (legitimately or not) the source was always available. If anything I'm wondering why it took this long to get out, at a time where very few people will probably care anymore now that there are many high-quality STG fangames. Maybe they just forgot about it and one day figured they'd just finally do this.