HOLY MOLY WE GOT A RETRO SHOOTER AND IT'S DAMN GOOD
And I made a video on Bilibili which is a No-hit-walk-through, I'll put my link below.
Story is fun to read, and make me wonder why these students are fiding relics, for research? Maybe has secrets?
The shooting part it's bit sticky when you try to turning around or ducking and shoot, but they're students come on, not a blonde hair guy shoot up everything with a heavy machine gun.
And I tried to translate your game title but I can't get over the "Ippan" meaning, so I translate the game title into Simplified Chinese as 《深海计划》, I used "Plan(计划)" to exchange "Ippan(一般)" because I think they got mission and they did something and coming back with the relic, that's like "Meaning Translation" I guess, if that's an incorrect translation meaning please tell me and I'll try my best to promote your game in China!