Loved the look and feel of the game. Simple concept and very fun to play!
Perhaps the scaling can be adjusted for a single scroll up and down? Like I use my finger to scroll up/down twice or thrice in some cases and so it's a bit difficult for me to keep up with the moving enemies and by the time I scale appropriately the enemies are out of range. (Perhaps that's a skill issue on me xD or perhaps that's the intended difficulty otherwise it'd be too easy.)
Druken mode was a bit difficult for me as it messes the controls (but then perhaps the enemies can be moving slower?) I tried to keep the count of enemies below 10 unfortunately couldn't. Solid game!