Use Enter button for submit, while working normally elsewhere - autohotkey

Question

I have a script that opens a GUI with a simple interface, which closes with Esc, and submits through the button. The script always runs in the background. I'm trying to find a way to make the Enter key work as a submit, but while still working normally everywhere else. I've tried using IfWinActive, but it doesn't work. Any ideas? thanks! (btw some of the code looks messy in this format, but the "unnecessary details" are there because this isn't the full script.)
Lwin & MButton::
Goto, Start
return
Start:
IfWinNotExist, New
{
Gui,1:-border
gui, font, s24, Product Sans ; Set 10-point Product Sans.
Gui, Add, Text,, Type here to search: ;controls the UI
Gui, Add, Edit, vTextInput
Gui, Add, Button, -WantReturn gSubmit w80, Go
Gui, Show, w400 h300, New
IfWinExist, New
Hotkey, Enter, Submit, On
return
}
Else
Return
IfWinExist, New
Esc::Gui, Destroy
return
IfWinExist, New
Enter::
Goto, Submit
return
Submit:
Gui, Submit ;destroys the UI when submitted
GuiControlGet, TextInput
Gui, Destroy
Else
{
link = https://www.google.com/search?q= %TextInput% ;search google
Run, %link%
}

Answer 1

The code really looks like some real horror haha.
So much legacy AHK or stuff that doesn't work. But anyway, can't fix all that since that isn't the full script.
The answer to the actual question is to make your button the default button:
Gui, -Border
Gui, Font, s24, % "Product Sans"
Gui, Add, Text, , % "Type here to search:"
Gui, Add, Edit, vTextInput
Gui, Add, Button, +Default gSubmit w80, % "Go"
Gui, Show, w400 h300, % "New"
return
Submit:
Gui, Submit
Run, % "https://www.google.com/search?q=" TextInput
return
Sure, you could also define your own hotkey, like you tried to, but there's just no reason to when the above is so convenient.