Just had a look at your game.
I liked the idea of playing as a bottle of poison, and you have used the premade assets with your own nicely.
The level design is pretty good as well as the levels get more difficult, with new obstacles as you progress.
2 things I think could be improved are the controls, they a bit too responsive, there is no forgiveness in them, and the other is that there is no sense of urgency in the game. For a platformer, this is normally done with a time limit, or something constantly chasing you that will cause you to lose the game if it catches up.
Thank you for the game.