I tried your game on my Pixel 2, and aside from the performance issues already mentioned by other posters, there are very clear 1px misalignments (buttons borders, screen edges) that make it fairly clear (imo) the app is not native.
I don't have a lot of Android devices to test with, though it looks perfect on the ones I have. I would love to see screenshots of the imperfections you're talking about, it would be a huge help! If you see this, please send them to rawrmaan [at] gmail [dot] com. Thank you!