Great game!
Discarding guns after one shot is a decent idea, the gameplay is good and doesn't have any problems at all, limited and recharging movement resources is an interesting way to lean into the theme, the UI for it is great for letting us know the counter too. The guns are great, having no way to recover health is a bit rough and the art is incredible in all aspects, like the menu screen, the way the knight rotates, the detail of two handing weapons and so on are great.
Having to press R to reload after running out of guns... it's hard to tell when it's happening or what's going on with that, so some sound effects or UI for it would go a long way to knowing if a reload is happening and how long it's going to take.
Great job on the game!