A new doujin 4:3 hori Neko Navy has been added to Dlsite. Here's the PV. The vibe is whimsical (e.g., the day 3 boss) and focused movement is eschewed. But the smooth gameplay has bite to it; there are point-blanking bonuses, and moreover a rechargeable bomb that converts bullets into scoring items. The game was developed in Unity 5, so doesn’t appear to have a default resolution, allowing it to scale (somewhat blurrily) to fit any monitor.
Of note is that the demo Koneko Navy at the dev’s site provides access to all seven stages of the game on hard (middle) difficulty, albeit without any continues or training options. This is an interesting marketing approach, which I’ve not seen before. I suppose folks that get hooked by the mechanics on their way to clearing hard will want to play on death, while others will want access to easy or continues to see the entire game. The MP3 soundtrack is a nice bonus.
In any event, as someone else pointed out to me elsewhere on here the full game is available on 
