Right now, the animated scenes and buttons have reduced quality to keep the game as light as possible, to be ready for many, many future contents of the game.
We have increased the quality a bit in the latest update. The quality can be increased further, significantly, in the cost of 8~10 times the size of the game now. So, we take it very carefully.
The game file is .APK, so you would have to download the game from the site (not from Itch io app) to your computer and open it with Bluestack installed.
For Android user, download it from the site (not from Itch io app) and simply install it and run.