Thanks for playing and giving feedback!
Yeah, enemies life is indeed completely random between 1 and 3, that creates a lot of impossible runs (specially a lot of yellow enemies can be super deadly). I lacked the time to polish the levels construction and therefore to balance the monsters properly, I focused more in making an interesting system that could be deducible without any tutorial or text. I may end up tweaking that once I finish the project I'm currently working on.