Completely agree. One thing I like about homebrew is that many recent instances introduce something new either mechanically or to the genre it represents.
The challenge with Spook-o’-tron would be that playing it involves using your fingers (and possibly controllers) in a way unfamiliar to many. And for those who have practiced with the game, it is still a solid arcade challenge. Heck you could add Estoscerro so you have multiple games with that controller design and make a randomized treasure-hunting level.
I get what you’re saying about The Incident (and I almost suggested Scramble but decided I didn’t want to suggest two shooting games different as they are) but technically any game could be mastered by practicing and memorizing the layout so I disagree that that would make The Incident a less fitting entry, especially if you draw from new levels developed since Kevin released the level editor.
And if you want to add other games that are more about running up the score, you could include Bovinium Quest, UXO, and Cowlitz (2nd).