Solid game, really well executed. I love the game mechanic, this is one of the best games I've played this jam. I think this is exactly the game Kenney must have been thinking for those assets. You can do a lot more with this and actually develop it into a full-blown game; with more polish, weapon/plane upgrades, change of mechanics (even though you obviously implemented a rotating mechanic because of the theme, I think it could work with non-rotating as well) and visual effects. For the jam game I would add a bomb indicator (I lost once because I ran out of bombs but did not see a bomb indicator in the HUD).