All eyes were on Nintendo after the company’s E3 Spotlight this morning, waiting for the publisher to demonstrate its upcoming 3DS game, Metroid: Samus Returns.

Theresa Apolinario, a member of Nintendo’s Treehouse Live team, showed off almost 50 minutes of footage from the game, which is a reimagining of Metroid 2: Return of Samus. The original game was released in 1991 for the Game Boy and, while there are elements from that game in Samus Returns, much of the gameplay has been changed and new abilities have been introduced. Still, Apolinario affirmed that themes from the original game wouldn’t be removed.

“This game is still about discovery and exploration,” said Apolinario. “There’s intense boss battles and so many pathways to discover.”

The gameplay footage above goes over quite a bit of detail from the game and includes commentary from co-creator Yoshio Sakamoto about the challenges the team faced while in development.

Metroid: Samus Returns will be released Sept. 15 for the Nintendo 3DS.