I was once surprised by this opening and lost quickly in a blitz game.
After 1. d4 e5!? (the Englund Gambit) 2. de5 Nc6 3. Nf3 Qe7 I tried to keep the pawn with 4. Bf4 which was a mistake.
'4. ...Qb4+ hitting the bishop and b2
'5. Qd2? (5. Bd2 is better although still losing) Qb2 6. Qc3 Bb4 White resigns.
What an embarrassing loss! 😄
Now having analyzed the opening I see Black's disadvantage. Poor King side development as his Queen blocks his dark squared Bishop. My strategy is to open lines, develop my pieces quickly and keep his King in the center. I also don't mind damaging my King side pawns since moving rook on the open g file can help in the attack.
Here is my recent game against the opening.
https://lichess.org/VIxCs9z5Q7eV
8 . Qd4 was a key move to:
a. allow White to castle Queen side and;
b. prevent Black from castling by threatening a7 but he blundered anyway.
I hope you learn from this and avoid losing like I did when you face the Englund Gambit.
Thanks for reading!