I'm spending too much time on this, so here's the comments on things I've found so far. In case it's not obvious, most of these issues have come up because I'm desperate. Desperation leads to trying all sorts of weird and wonderful things that reveal more and more shortcomings in the game. It's better to provide in-game hints so that players don't get this desperate. I suspect that I have got into an unwinnable state because I've used things that are needed elsewhere. Who knows? Anyway, here goes...
I played version 1.1.0.
Your title screen is chopped off at the bottom. This might be an Adventuron issue that I've reported to Chris. When scaling, it seems to use the horizontal dimensions and ignores the vertical dimensions. Try using a different aspect ratio. I've been using 4:3 and that seems to work okay.
The title screen and itch.io game page have the title as "Burgle, Burgle", but the game_information{} block has it as "BURGLE-BURGLE".
In the intro, "...their 5 treasures" should be "...his five treasures."
Consider overriding the default CREDITS with your own. You can still see the system credits with *CREDITS.
Consider overriding the system HELP with your own, as the default response is longer than 6 words.
Make sure that all sentences in responses end with a full stop.
You can't SIT or SIT COUCH.
You can GET ALL in the shop to bypass buying items, but when I try to drop those items, it says "Don't have.", even though they're in my inventory. Fortunately, I can DROP ALL to drop those items and then do the right thing.
When I BUY SODA, it says "Take them." I thought "them" should have been "it", as I only bought one item, but it turns out that I had bought both items without knowing it. Consider buying one item at a time. Thus when you buy the first item, you are left with one coin. When you buy the second item, you are left with no coins. You should be able to buy the items in any order.
You should provide a response to X SODA and X POTION, especially the latter, so that you know what they are. This should give you an idea where to use them.
I have given the soda to the guard before the potion, now I'm worried that I might need it later. If I do need it later, you should prevent the guard from drinking it (e.g. "I don't drink lolly water."), as the game rules state that you should not be able to get the game into an unwinnable state.
I think *GULP* should be outside the quotes, i.e. *Gulp* "Thanks." or "Thanks." *Gulp*
X RATHERDASHING after disabling him says, "Nothing special." This should give the same response as X SLEEPING, as players are more likely to examine the noun than the adjective.
When you OPEN DOOR, "Doesn't work." should be something like "It's locked." When you UNLOCK DOOR, "Not understood." should be something like "Need key." Also, allow for other things that the player is likely to try like CLOSE, LOCK, HIT, KICK, BREAK, SMASH, KNOCK, TAP and so on and also PICK LOCK.
When you go north at manor courtyard, it says "Door's locked", but should really say "Door's closed." You should only get told that the door is locked when you try to open it. Think about it. This is how it works in real life.
You can't ENTER/CLIMB/GO/USE WINDOW. I forgot that I had a ladder with me, but any attempt to enter the window without the ladder should have said "Too high." or something like that.
Also allow for OPEN, CLOSE, BREAK WINDOW and so on.
You can't CLIMB LADDER.
"Upperhallway" should be two words, but that would make the room descriptions three words. Therefore, change "upperhallway" to "hallway", as "upper" isn't necessary, or delete all the directions and just have a number of identical upper hallways. Ditto for "lowerhallway". Also, change "south upperhallway" to "centre hallway", as there's no further hallway immediately to its north.
Using the flask is equivalent to unlocking a door. You should still need to open the door before you can go N or W or whatever.
"Lord" should be a synonym for "Clayton".
You can't READ BOOK.
You can't WAKE CLAYTON.
It doesn't understand UNTIE, even though something is tied.
"Butterknife" should be "Butter knife" (i.e. two words). Even so, "knife" should be a synonym for "butterknife".
I felt that you should be able to OPEN CABINET, otherwise it would just be shelves. I later discovered that it was locked.
It didn't understand PUSH/PULL/TURN/ROLL/OPEN/HIT/BREAK/SMASH/CUT/PRY/PRISE/PRIZE/LEVER/JEMMY/CLEAN/WASH/WIPE BARREL and didn't understand MOLD or MOULD.
You can't WASH/CLEAN/WIPE/RUB KEY, even with soap.
You can't FLUSH/CLEAN/UNCLOG/USE TOILET.
"Guard" should be a synonym for "Dennis" in the appropriate location. You can't TALK/SPEAK/ASK/QUESTION/TELL/GIVE/SHOW/HIT/KILL/ATTACK/FIGHT/KICK/KISS/HUG/EMBRACE/TOUCH/FEEL/SEARCH DENNIS.
When you SHARPEN BUTTERKNIFE a second time, "Doesn't work." should be "Already sharp." When you EXAMINE BUTTERKNIFE after sharpening it, "Nothing special." should be "Sharp."
You can't RUB/SCRAPE/WIPE/WASH/CLEAN/OIL/LUBRICATE FLOOR with soap or similar things with SOAP as the noun.
You can't FILL SINK.
You can't WET/LATHER/CUT/SHAVE/SCRAPE/GRATE SOAP.
More later if I can get any further.
Incidentally, I really like this game, but it's very frustrating.