It is immediately punishable with 2...d6. White doesn't have a good way to protect the e-pawn.
f4 is going to get crushed by dxe5 followed by Qh4+
d4 is just bad. After 3...dxe6 4. dxe5, Qxd1 5. Kxd1 black is better
Nf3 is probably best but after 3...dxe5 4. Nxe5, Bd6 white doesn't really have anything other than moving the knight back to f3 and now black ...