I have started playing Doodley the Duck and am enjoying it so far, but it is very frustrating. Here are some initial comments:
Great title, but I think you should include the title in the title screen.
The goal is to find your five ducklings but there are only four shown in the title screen. Any chance of adding another one?
Nice colour scheme.
Make sure all sentences end with a full stop. Avoid exclamation marks unless it really is an exclamation. Don't use multiple exclamation marks, e.g. "Danger danger!!!" could be "Danger! Danger!".
"anymore" should be "any more", i.e. two words.
You should override HELP, as the system help exceeds the six-word limit.
Consider overriding CREDITS, as well. The system credits can still be accessed using *CREDITS.
HUNT is a pretty obscure verb to use. I don't see ducks as hunters, but hunted. Perhaps give a hint to use it.
"doggo" should be synonym for "dog".
"pig" and "pork" should be synonyms for "piggy".
A "pig house" is normally called a "pig sty".
X HOLES: "hidding" should be "hiding".
If you CATCH CATERPILLAR when hands are full, it tells you your hands are full, then gets it anyway and drops it in the room. In this case, the response is inappropriate. You can then CATCH CATERPILLAR again and the same thing happens, but you only end up with one caterpillar, not two. Whereas, if you've got a caterpillar in your inventory, it says you've got one already.
Doesn't understand a lot of common verbs such as PRESS (synonym for PUSH), MOVE, SHOW, SMELL (particularly relevant in this game), THROW, TICKLE (because there is a feather) and so on.
"To risky, wait..." should be "Too risky, wait..."
If I understand this correctly, "*bush piips hungrilly*" should be "*bush peeps hungrily*" and "Very far piips" should be "Very far peeps".
"buggers" should be "boogers".
I get the impression that this is like 5 mini adventures and there is one duckling in each area. It seems like you need one type of food for eack duckling (I might be wrong about this), but there are no clues as to which food is required for which duckling, so it becomes a matter of trial and error. There also appears to be a number of red herrings, but I might be wrong about that too.
The hunger, thirst and sleep aspects are a real pain. The timing between getting hungry, thirsty etc. is far too short and you spend all your time just trying to stay alive with no spare time to look for the ducklings. Needless to say, I very quickly got fed up with this and played with this turned off. When I've solved it, I might come back and turn this back on again, but consider making the times more generous, remove it altogether or integrate it into the game. It's certainly not fair if you need to eat the food to stay alive when the same food is required for your ducklings.
Incidentally, I've only rescued Lui so far, but I have a hunch about at least three of the others.