This is a great little game. I really enjoyed it. My test comments are mainly related to cosmetic issues and commands I tried that didn't work. I was using version 1.0.9. It looks like you have already fixed most of the issues raised by others.
Can you add the title to the title screen? (Personally, I don't like the title screen, as it might give people the wrong impression about what to expect in the game.)
Consider overriding CREDITS with something prettier. This is not restricted to six words. You can still see the system credits with *CREDITS.
Also consider overriding HELP, as the default system response is more than six words. The type of help provided with the system help can be provided on your itch.io page if you haven't done it already.
In master bedroom, "parents bed" should be "parents' bed" (assuming two parents).
You're missing a few full stops at the end of sentences.
The response to EXAMINE MIRROR should have the exclamation mark AFTER the closing double quote.
Avoid excessive use of exclamation marks. Only use these if it really is an exclamation.
When you OPEN DRAWER, "BALLONS" should be "BALLOONS".
Exclamation mark (or preferably full stop) should not be part of the rainbow colour scheme after OPEN DRAWER, PUNCH PAPER and COOK BURGERS.
There's a bed, but SLEEP is not understood and you can't SIT BED or LIE BED or MAKE BED.
"multi colored" should be "multi-colored", as it's a compound adjective.
When you EXAMINE COMPUTER a second time, you find the yellow note again. Use has_not_created "yellow_note" to ensure that the response is different after finding the note.
Music CD and CD case is troublesome. I wanted to put the CD in the case. I tried INSERT/PUT/PLACE/REPLACE/COMBINE/ATTCH/JOIN CD, all to no avail. (This was before I knew there was somewhere else to put the CD.)
"APPETISERS" should be a synonym for "APPETIZERS" for those of us that speak English rather than American.
I feel that "DOGFOOD" and "DOGBOWL" should be "DOG FOOD" and "DOG BOWL" respectively, i.e. two words. You've got "FOOD" as a synonym for "DOGFOOD", but you don't have "BOWL" as a synonym for "DOGBOWL".
Put full stop after "It's freezing ouside" and "Garden door is frozen", so that you have two sentences in each of those responses.
You should be able to INSERT CD into boombox rather than (or in addition to) START BOOMBOX, as the latter doesn't really make sense without a CD inserted. It would be better if you do INSERT CD and START BOOMBOX as two separate commands. If you EXAMINE BOOMBOX, it already gives you a hint about what you need to do. If you EXAMINE CD after inserting CD, but before starting it, it can tell you "CD inserted." If you START BOOMBOX without inserting the CD, it should say, "No CD."
It didn't understand POUR BEVERAGES in the messy garage or MELT ICE, MELT DOOR, UNFREEZE DOOR, HEAT DOOR, USE BEVERAGES, HIT DOOR, KICK DOOR, BREAK DOOR, KNOCK DOOR, TAP DOOR, SMASH DOOR. (This was before I discovered how to open the door.)
It didn't understand DRINK BEVERAGES. Perhaps add a response like "Too hot." (when warm) or "Save for party guests." when cold.
"Hot air fix door swings open" doesn't make sense. Perhaps it should be "Hot air works. Door swings open."
MICROWAVE should be synonym for OVEN.
Can't CLOSE OVEN/BAG/CABINET/FRIDGE even though you can open them.
Can't INSERT/PUT/PLACE/USE/THRUST/JAB/STAB FORK in socket in garage. (I thought I would either get electrocuted or cause a short circuit to melt the ice.)
Can't INSERT/COOK/WARM/HEAT MEATBALLS/BURGERS in kitchen.
When you drop the final treasure, the response flashes up and disappears before you get a chance to read it. Put a press_any_key statement after the print statement so that you get a chance to read it.
As I said earlier, I love the game. It just needs a little bit of tidying up to make it really professional. Now, onto the next game.