I wouldn't have minded my game being 60mb if i felt my game should be taking up that much (due to high graphics etc). But my game is an Autorunner game with added graphics that total to 9mb on Construct. I've downloaded quite a few games around similar size to 20mb and even then, when they're installed they take up around 35mb.
Compared to other games, my game taking up 60mb does seem high, for example i have Zombie Dash on my phone, which is pretty similar to my game in terms of gameplay and graphics, and its only a 20mb download but when installed it takes up 1.36mb. So there are games that can take up even less space when installed.
The fact that with my game, it takes up more than twice the download size is the issue i have.
Also i built the game with CocoonJS at first and with that same game totaled to 9mb download size, compared to the 20mb with Crosswalk. I don't want to use CocoonJS as i believe Crosswalk is better to use for Android games, so i'm a little bit frustrated with the file size on Crosswalk as a result.