I played the game (for a third time) on hard mode and to get missing achievements, but I simply gave up.

The bugs that were in the game at release are still all in there. Heroes getting stuck on ladders or in the middle of a jump.

Enemies getting stuck on a rail, being half inside and half outside the game, and thus impossible to destroy. Enemies suddenly freezing and not even reacting when you dance in front of them.

Opening savegames make your heroes wander off, leaving their safe position and getting caught by the enemy. After an alarm, enemies that don't beam up, but are stuck.

Savegames that completely break your game when loaded.