Malu and I have been playing a lot of Centipede Recharged and love it. This game is less lovable, but still kind of interesting as a weird stepchild of the Centipede series. The enemies still act according to a grid, but you can rotate your cannon freely, which feels almost like cheating.
Screenshots marked with 🍒 are created by syltefar and are considered public domain, free to use for anything. If you want to, you can note where you found it and link to this page.