Semi-on-the-fly remarks:

1. As I have an interest in foreign languages including Russian (I am using Duolingo), I wonder whether you wrote ‘we do the whole game’ while meaning ‘we will do the whole game’ because of the perfective/imperfective issue. ;)
2. I like the cute ‘music box’ music! :)
3. I am not sure that I understand what the ‘promotion box’ in the instructions is…
4. Controls are QWERTY-only instead of layout-independent (I have an AZERTY keyboard). This makes it rather hard for me to play the game, but fortunately, the arrow keys are enabled.
5. I like the character’s walking animation, the way he raises his legs is neatly detailed. :)
6. I notice the character looks at the mouse, but only throws vertically; does the mouse have a gameplay usefulness?
7. Ah, I thought you could jump, but you can move along depth! I like it. :)
8. It is sometimes a bit hard to catch the fish, but maybe this boils down to knowing precisely where you have to put the feet to detect the ponds.
9. What happens when your ‘wet-o-meter’ / humidity/water level goes to zero? It did not seem to change anything for me. Oh, spoke too soon, I just lost. X)
10. I got the yellow raincoat when touched by the dark-grey cloud; I am unsure if this is a coincidence or not. I am also unsure of what the effect is (the ‘promotion box’??), as the water meter continues to go down. Maybe invincibility?
    Ah, shortly after, the cloud does drop a raincoat down, so I can see it! :)
11. By the way, no walking animation when wearing the raincoat? I guess you lacked the time. ;)
12. Possible bug: at some point, my life goes down continuously for no reason. Maybe because I switched between windows?
13. WOW, that Maria cloud goes into super fast mode when reaching about mid-life! :o
14. Lost at 2 or 3 boss health points still there; this is going so fast!
    I think two things make the game hard: the cloud’s speed increase, and the way water is managed (I am still not sure whether standing in ponds has an influence). I did not beat the game (and want to stay reasonable about the amount of time I spend on each game!! I tend to overdo it).

Conclusion: the fight seems rather well balanced as a boss fight: just a bit too hard to win on your first attempt, probably beatable after some more. :) The way you implemented the limitation amounts to a boss/enemy pattern (using a cloud is witty), which is classic in itself. I also think the game is cute overall. :) On the ergonomics side, I would advise showing visually or/and with audio when a pond is ‘reachable’ by the character (for example, changing its outline colour).

Small question: what happens when you beat Maria? :)

(By the way, just putting here that my game is pending until I get the submission form.)