The retro-quality sound effects are really nice! =)
The theme was integrated very originally, really funny idea!
Pixel blocks of any size are always good, lol.

Nice work! I really enjoyed the game concept, and found it engaging.

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Thinking a little about the UX...

I had trouble mentally mapping

W      S

A        D

to my mental model of four directions 

   W

A   D

    S

and then to which color each one was.

I wonder if showing the potion colors UI in the same layout (four directions) as keyboard/controller would make it easier to remember which key is which color?

Alternatively, you could make them potions on a belt displayed horizontally, and then use 1,2,3,4.

Thanks!

Took a few tries to get the timing right, but once I got it enjoyed it.  I think slowly increasing the speed of the patients would be an interesting mechanic to add.  

Nice game, kinda hard for me to get the timing right (kinda the point of the game tho)

I think if you allowed the player to mix potions (like yellow + blue = green ) or something else to flair up the game, it would increase the skillcap.

I also think having a ending menu w/ a score is important for these types of game. So you can compare w/ people & friends afterward.

Good game, & also good polish.

Great game. I had some trouble when I started but than got the hang of it. I am not that good :).

I enjoyed the game with gamepad, I'm a big fan of xbox scheme so managed to score like 30 points, congrats!!

 Really good concept here, maybe  it just me but its way to hard, Best score i could get was like 3, I think the problem is that potion thrower should be further to the left, so that his potions dont directly over lap where the peasants die.