I really like the art and how consistent it feels, and I also appreciate how generous the game is with ammo and guns compared to Enter the Gungeon. Fighting the cores is an interesting idea as well, though it can feel a bit boring when there aren’t enemies around. On the other hand, I found the music too loud (I had to turn it down to 2), collisions against walls felt rough, and needing multiple keys to open one chest felt strange, if it stays that way, maybe showing multiple keyholes would make it clearer. I also wished shooting felt faster, especially if holding down the mouse button could fire as fast as possible. The game would benefit from a minimap and warp portals like Gungeon, clearer feedback on why the boss door can’t be opened, and a little more excitement added to core fights. Overall, the mix of cute graphics with Enter the Gungeon-style gameplay is an interesting blend, I'd be curious to see where you take it.