It's Mock Up of the first zone of Sonic Story - Aqua Terra. When Sonic was hanging around with Amy and Tails, he saw a big Light shining from afar. He decided to discover it... It's big abandoned Aqua Park that surrounded by Coast and Hills. Act 1 takes place at the Coast that leads to this Aqua Park.

P.S Thanks to CatswellMeow for creating original sprites for this zone. https://gamejolt.com/@CatswellMeow

P.S.S Still looking for Music Composers and Spriters. If someone wants to help me, talk to me in private.