No revenue estimate for PSN — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $25.7M — a different platform, not this one.

Enter the Gungeon

Enter the Gungeon is a bullet hell dungeon crawler following a band of misfits seeking to shoot, loot, dodge roll and table-flip their way to personal absolution by reaching the legendary Gungeon’s ultimate treasure: the gun that can kill the past. Select a hero [or team up in co-op] and battle your way to the bottom of the Gungeon by surviving a challenging and evolving series of floors filled with the dangerously adorable Gundead and fearsome Gungeon bosses armed to the teeth. Gather precious loot, discover hidden secrets, and chat with opportunistic merchants and shopkeepers to purchase powerful items to gain an edge. The Gungeon: Enter the Gungeon – a constantly evolving bullet hell fortress that elegantly blends meticulously hand-designed rooms within a procedurally-generated labyrinth bent on destroying all that enter its walls. But beware – the Gungeon responds to even the most modest victory against its sentries and traps by raising the stakes and the challenges found within!