My most complete computer game to date is, without question, Gem Raider. I had been working on one version or another of this design since I had started programming computer games.
In fact, one of the first games I coded for Windows (using VB3! in the mid-90s) was called “Skater”, and was a very early prototype of the design. That one had moving enemy crafts, a very stuttery feel, and horrendous graphics. I’m quite happy with how Gem Raider turned out. As mentioned on its page, it’s my favorite of the games I’ve made so far (and my wife’s too).