I like it, the music is nice.
My criticisms would be,
When you collect the last pill, it goes straight to the Level complete, not having to hang around for the timer.
I don't think the detail you have put into the sprite works well with the simple level design/world
and i don't really like the fact overdosing kills you, its more a pain when the game is centered around collecting the pills, maybe if you collect too much you get some weird control scheme instead? I dunno i just think the Overdose kills the flow.
Theres also something about the controls when jumping, feels off, though i don't know why.