The difficulty curve is just right and as the review says, the graphics are very pretty.

The game has been criticized for its steep difficulty curve.

The most popular complaint focused on the game's extreme difficulty curve.

The difficulty curve is also substantially lower than past BIT.

The difficulty curve of the game increases significantly after the first level and can be somewhat unforgiving.

In addition, he complimented the game's depth, difficulty curve and replay value.

The difficulty curve was considered a problem, with "boring" grinding required to progress at some points.

The difficulty curve is not very good, similar to Demon's Souls.

The puzzle rooms are incredibly well designed in that there's no hard and fast rule with the game's difficulty curve.

Some critics felt the game's difficulty curve was uneven.