Hi!
First, thank you for your feedback.
Yes, the problem with the pixel art is that I picked a couple of pixel art packs and used it on the game, tried to make it cohesive but it's not perfect. In future versions I'd like to add pixel art made specifically for the game.
Yep I intend to add more progression and some effects to the weapons and armor.
And finally behind the door should have been a boss but is bugged and it disappears after the first run and never respawns again.