Frozenbyte sent out the following

 

Has-Been Heroes, the challenging roguelike game of strategy and action from Frozenbyte and GameTrust (coming to Switch, Xbox One, PS4 and PC) has been delayed by a week in Europe and Australia/New Zealand due to logistical issues. The new launch date for those territories is Tuesday, April 4th.
The US and Steam releases are still on target for Tuesday, March 28th.
Joel Kinnunen, Vice President of Frozenbyte and Producer on Has-Been Heroes, together with Marketing Manager Kai Tuovinen issued an apology video in typical Frozenbyte tradition:

The delay is unfortunate, but if there is something they need to clear before the game can launch in those regions, then it has to be done. We hope to have review of the game shortly and to share our opinions on it.
Source: PR Email