Sorry, but in my experience it's simply not true that Crosswalk runs faster than CocoonJS. Crosswalk does simply perform like the mobile Chrome browser would, while CJS is accelerated and can actually reach native-like performance in otherwise hopeless cases.
Your game may work good with Crosswalk, but it's also not crucial for that type of game to have smooth 60 fps or anything close to that. Don't get me wrong, I do like Crosswalk, but I also like to stay realistic about the way it performs currently.
I had FPS counters for both my CJS and Crosswalk build, practically the same, except CJS has stutters (probably due to too much memory use) while Crosswalk is smooth. And its 50fps on older devices, with Samsung S4 or Nexus 7 pegged at constant 60 fps. It is crucial for a fast paced physics shooter to have fast frame rate.
Because of how well Crosswalk worked, it inspired me to make another complex game, sandbox space RTS: Trade ships flying around to and from jump points to stations, patrols zooming about the sector, pirates looming and even big fleet fights between major powers. Missiles with trails, point defense lasers shooting missiles down etc. Heaps of particles, and rotating asteroids, planets and moons. So far its running very smooth on Tegra 3 devices.
Performance wise, I have zero complaints. Whats lacking are features, ie. Monetization, Social (Google play features).