Thanks for your feedback!
Unfortunately I didn't have time to produce a level design that allows to explore all the pills' functionalities (for example, I intended to make a way to use pills against enemies to lower some of their status).
In the future, I will place enemies with high status. This will force the player to use the pills.
Oh, and some of the power-ups you mentioned are already present in the game, for example, if you set the attack to maximum using the red pills, it is possible to defeat enemies with one hit and if you max your defense, you become invincible and enemies can't hurt you (but spikes can).