I played for a while but couldn't get the extra speed buff to trigger somehow, which made it really hard to dodge stuff and collect milk at the same time :( So I couldn't really progress past level 3.
In general I think everything feels just a little too slow (up until the point I reached anyway). The ship could be faster by default, the milk bar could fill a little faster. That way progress would be more tangible. I personally would have chosen a more action-like background track as well. The current track kind of adds to the 'chill milk collector' vibe which the game definitely isn't.
I definitely think there's lots of neat stuff in the game! People just aren't getting there because it takes them too long.